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elasticdump

Tools for moving and saving indices from Elasticsearch and OpenSearch

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Installing

(local)

npm install elasticdump
./bin/elasticdump

(global)

npm install elasticdump -g
elasticdump

Use

Standard Install

Elasticdump works by sending an input to an output. Both can be either an elasticsearch URL or a File.

Elasticsearch/OpenSearch:

File:

Stdio:

You can then do things like:

# Copy an index from production to staging with analyzer and mapping:
elasticdump \
  --input=http://production.es.com:9200/my_index \
  --output=http://staging.es.com:9200/my_index \
  --type=analyzer
elasticdump \
  --input=http://production.es.com:9200/my_index \
  --output=http://staging.es.com:9200/my_index \
  --type=mapping
elasticdump \
  --input=http://production.es.com:9200/my_index \
  --output=http://staging.es.com:9200/my_index \
  --type=data

# Backup index data to a file:
elasticdump \
  --input=http://production.es.com:9200/my_index \
  --output=/data/my_index_mapping.json \
  --type=mapping
elasticdump \
  --input=http://production.es.com:9200/my_index \
  --output=/data/my_index.json \
  --type=data

# Backup and index to a gzip using stdout:
elasticdump \
  --input=http://production.es.com:9200/my_index \
  --output=$ \
  | gzip > /data/my_index.json.gz

# Backup the results of a query to a file
elasticdump \
  --input=http://production.es.com:9200/my_index \
  --output=query.json \
  --searchBody="{\"query\":{\"term\":{\"username\": \"admin\"}}}"
  
# Specify searchBody from a file
elasticdump \
  --input=http://production.es.com:9200/my_index \
  --output=query.json \
  --searchBody=@/data/searchbody.json  

# Copy a single shard data:
elasticdump \
  --input=http://es.com:9200/api \
  --output=http://es.com:9200/api2 \
  --input-params="{\"preference\":\"_shards:0\"}"

# Backup aliases to a file
elasticdump \
  --input=http://es.com:9200/index-name/alias-filter \
  --output=alias.json \
  --type=alias

# Import aliases into ES
elasticdump \
  --input=./alias.json \
  --output=http://es.com:9200 \
  --type=alias

# Backup templates to a file
elasticdump \
  --input=http://es.com:9200/template-filter \
  --output=templates.json \
  --type=template

# Import templates into ES
elasticdump \
  --input=./templates.json \
  --output=http://es.com:9200 \
  --type=template

# Split files into multiple parts
elasticdump \
  --input=http://production.es.com:9200/my_index \
  --output=/data/my_index.json \
  --fileSize=10mb

# Import data from S3 into ES (using s3urls)
elasticdump \
  --s3AccessKeyId "${access_key_id}" \
  --s3SecretAccessKey "${access_key_secret}" \
  --input "s3://${bucket_name}/${file_name}.json" \
  --output=http://production.es.com:9200/my_index

# Export ES data to S3 (using s3urls)
elasticdump \
  --s3AccessKeyId "${access_key_id}" \
  --s3SecretAccessKey "${access_key_secret}" \
  --input=http://production.es.com:9200/my_index \
  --output "s3://${bucket_name}/${file_name}.json"

# Import data from MINIO (s3 compatible) into ES (using s3urls)
elasticdump \
  --s3AccessKeyId "${access_key_id}" \
  --s3SecretAccessKey "${access_key_secret}" \
  --input "s3://${bucket_name}/${file_name}.json" \
  --output=http://production.es.com:9200/my_index
  --s3ForcePathStyle true
  --s3Endpoint https://production.minio.co

# Export ES data to MINIO (s3 compatible) (using s3urls)
elasticdump \
  --s3AccessKeyId "${access_key_id}" \
  --s3SecretAccessKey "${access_key_secret}" \
  --input=http://production.es.com:9200/my_index \
  --output "s3://${bucket_name}/${file_name}.json"
  --s3ForcePathStyle true
  --s3Endpoint https://production.minio.co

# Import data from CSV file into ES (using csvurls)
elasticdump \
  # csv:// prefix must be included to allow parsing of csv files
  # --input "csv://${file_path}.csv" \
  --input "csv:///data/cars.csv"
  --output=http://production.es.com:9200/my_index \
  --csvSkipRows 1    # used to skip parsed rows (this does not include the headers row)
  --csvDelimiter ";" # default csvDelimiter is ','

Non-Standard Install

If Elasticsearch/OpenSearch is not being served from the root directory the --input-index and --output-index are required. If they are not provided, the additional sub-directories will be parsed for index and type.

Elasticsearch/OpenSearch:

# Copy a single index from a elasticsearch:
elasticdump \
  --input=http://es.com:9200/api/search \
  --input-index=my_index \
  --output=http://es.com:9200/api/search \
  --output-index=my_index \
  --type=mapping

# Copy a single type:
elasticdump \
  --input=http://es.com:9200/api/search \
  --input-index=my_index/my_type \
  --output=http://es.com:9200/api/search \
  --output-index=my_index \
  --type=mapping

Docker install

If you prefer using docker to use elasticdump, you can download this project from docker hub:

docker pull elasticdump/elasticsearch-dump

Then you can use it just by :

Example:

# Copy an index from production to staging with mappings:
docker run --rm -ti elasticdump/elasticsearch-dump \
  --input=http://production.es.com:9200/my_index \
  --output=http://staging.es.com:9200/my_index \
  --type=mapping
docker run --rm -ti elasticdump/elasticsearch-dump \
  --input=http://production.es.com:9200/my_index \
  --output=http://staging.es.com:9200/my_index \
  --type=data

# Backup index data to a file:
docker run --rm -ti -v /data:/tmp elasticdump/elasticsearch-dump \
  --input=http://production.es.com:9200/my_index \
  --output=/tmp/my_index_mapping.json \
  --type=data

If you need to run using localhost as your ES host:

docker run --net=host --rm -ti elasticdump/elasticsearch-dump \
  --input=http://staging.es.com:9200/my_index \
  --output=http://localhost:9200/my_index \
  --type=data

Dump Format

The file format generated by this tool is line-delimited JSON files. The dump file itself is not valid JSON, but each line is. We do this so that dumpfiles can be streamed and appended without worrying about whole-file parser integrity.

For example, if you wanted to parse every line, you could do:

while read LINE; do jsonlint-py "${LINE}" ; done < dump.data.json

Options

elasticdump: Import and export tools for elasticsearch
version: %%version%%

Usage: elasticdump --input SOURCE --output DESTINATION [OPTIONS]

Core options
--------------------
--input
                    Source location (required)

--input-index
                    Source index and type
                    (default: all, example: index/type)

--output
                    Destination location (required)

--output-index
                    Destination index and type
                    (default: all, example: index/type)


Options
--------------------
--big-int-fields
                    Specifies a comma-seperated list of fields that should be checked for big-int support
                    (default '')

--bulkAction
                    Sets the operation type to be used when preparing the request body to be sent to elastic search.
                    For more info - https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-bulk.html
                    (default: index, options: [index, update, delete, create)

--ca, --input-ca, --output-ca
                    CA certificate. Use --ca if source and destination are identical.
                    Otherwise, use the one prefixed with --input or --output as needed.

--cert, --input-cert, --output-cert
                    Client certificate file. Use --cert if source and destination are identical.
                    Otherwise, use the one prefixed with --input or --output as needed.

--csvConfigs
                    Set all fast-csv configurations
                    A escaped JSON string or file can be supplied. File location must be prefixed with the @ symbol
                    (default: null)

--csvCustomHeaders  A comma-seperated listed of values that will be used as headers for your data. This param must
                    be used in conjunction with `csvRenameHeaders`
                    (default : null)

--csvDelimiter
                    The delimiter that will separate columns.
                    (default : ',')

--csvFirstRowAsHeaders
                    If set to true the first row will be treated as the headers.
                    (default : true)

--csvHandleNestedData
                    Set to true to handle nested JSON/CSV data.
                    NB : This is a very opinionated implementaton !
                    (default : false)

--csvIdColumn
                    Name of the column to extract the record identifier (id) from
                    When exporting to CSV this column can be used to override the default id (@id) column name
                    (default : null)

--csvIgnoreAutoColumns
                    Set to true to prevent the following columns @id, @index, @type from being written to the output file
                    (default : false)

--csvIgnoreEmpty
                    Set to true to ignore empty rows.
                    (default : false)

--csvIncludeEndRowDelimiter
                    Set to true to include a row delimiter at the end of the csv
                    (default : false)

--csvIndexColumn
                    Name of the column to extract the record index from
                    When exporting to CSV this column can be used to override the default index (@index) column name
                    (default : null)

--csvLTrim
                    Set to true to left trim all columns.
                    (default : false)

--csvMaxRows
                    If number is > 0 then only the specified number of rows will be parsed.(e.g. 100 would return the first 100 rows of data)
                    (default : 0)

--csvRTrim
                    Set to true to right trim all columns.
                    (default : false)

--csvRenameHeaders
                    If you want the first line of the file to be removed and replaced by the one provided in the `csvCustomHeaders` option
                    (default : true)

--csvSkipLines
                    If number is > 0 the specified number of lines will be skipped.
                    (default : 0)

--csvSkipRows
                    If number is > 0 then the specified number of parsed rows will be skipped
                    NB:  (If the first row is treated as headers, they aren't a part of the count)
                    (default : 0)

--csvTrim
                    Set to true to trim all white space from columns.
                    (default : false)

--csvTypeColumn
                    Name of the column to extract the record type from
                    When exporting to CSV this column can be used to override the default type (@type) column name
                    (default : null)

--csvWriteHeaders   Determines if headers should be written to the csv file.
                    (default : true)

--customBackoff
                    Activate custom customBackoff function. (s3)

--debug
                    Display the elasticsearch commands being used
                    (default: false)

--delete
                    Delete documents one-by-one from the input as they are
                    moved.  Will not delete the source index
                    (default: false)

--delete-with-routing
                    Passes the routing query-param to the delete function
                    used to route operations to a specific shard.
                    (default: false)

--esCompress
                    if true, add an Accept-Encoding header to request compressed content encodings from the server (if not already present)
                    and decode supported content encodings in the response.
                    Note: Automatic decoding of the response content is performed on the body data returned through request
                    (both through the request stream and passed to the callback function) but is not performed on the response stream
                    (available from the response event) which is the unmodified http.IncomingMessage object which may contain compressed data.
                    See example below.

--fileSize
                    supports file splitting.  This value must be a string supported by the **bytes** module.
                    The following abbreviations must be used to signify size in terms of units
                    b for bytes
                    kb for kilobytes
                    mb for megabytes
                    gb for gigabytes
                    tb for terabytes
                    e.g. 10mb / 1gb / 1tb
                    Partitioning helps to alleviate overflow/out of memory exceptions by efficiently segmenting files
                    into smaller chunks that then can be merged if needs be.

--filterSystemTemplates
                    Whether to remove metrics-*-* and logs-*-* system templates
                    (default: true])

--force-os-version
                    Forces the OpenSearch version used by elasticsearch-dump.
                    (default: 7.10.2)

--fsCompress
                    gzip data before sending output to file.
                    On import the command is used to inflate a gzipped file
                    
--compressionLevel
                    The level of zlib compression to apply to responses.
                    defaults to zlib.Z_DEFAULT_COMPRESSION

--handleVersion
                    Tells elastisearch transport to handle the `_version` field if present in the dataset
                    (default : false)

--headers
                    Add custom headers to Elastisearch requests (helpful when
                    your Elasticsearch instance sits behind a proxy)
                    (default: '{"User-Agent": "elasticdump"}')
                    Type/direction based headers are supported .i.e. input-headers/output-headers
                    (these will only be added based on the current flow type input/output)

--help
                    This page

--ignore-errors
                    Will continue the read/write loop on write error
                    (default: false)

--ignore-es-write-errors
                    Will continue the read/write loop on a write error from elasticsearch
                    (default: true)

--inputSocksPort, --outputSocksPort
                    Socks5 host port

--inputSocksProxy, --outputSocksProxy
                    Socks5 host address

--inputTransport
                    Provide a custom js file to use as the input transport

--key, --input-key, --output-key
                    Private key file. Use --key if source and destination are identical.
                    Otherwise, use the one prefixed with --input or --output as needed.

--limit
                    How many objects to move in batch per operation
                    limit is approximate for file streams
                    (default: 100)

--maxRows
                    supports file splitting.  Files are split by the number of rows specified

--maxSockets
                    How many simultaneous HTTP requests can the process make?
                    (default:
                      5 [node <= v0.10.x] /
                      Infinity [node >= v0.11.x] )

--noRefresh
                    Disable input index refresh.
                    Positive:
                      1. Much increased index speed
                      2. Much less hardware requirements
                    Negative:
                      1. Recently added data may not be indexed
                    Recommended using with big data indexing,
                    where speed and system health is a higher priority
                    than recently added data.

--offset
                    Integer containing the number of rows you wish to skip
                    ahead from the input transport.  When importing a large
                    index, things can go wrong, be it connectivity, crashes,
                    someone forgets to `screen`, etc.  This allows you
                    to start the dump again from the last known line written
                    (as logged by the `offset` in the output).  Please be
                    advised that since no sorting is specified when the
                    dump is initially created, there's no real way to
                    guarantee that the skipped rows have already been
                    written/parsed.  This is more of an option for when
                    you want to get as much data as possible in the index
                    without concern for losing some rows in the process,
                    similar to the `timeout` option.
                    (default: 0)

--outputTransport
                    Provide a custom js file to use as the output transport

--overwrite
                    Overwrite output file if it exists
                    (default: false)

--params
                    Add custom parameters to Elastisearch requests uri. Helpful when you for example
                    want to use elasticsearch preference
                    --input-params is a specific params extension that can be used when fetching data with the scroll api
                    --output-params is a specific params extension that can be used when indexing data with the bulk index api
                    NB : These were added to avoid param pollution problems which occur when an input param is used in an output source
                    (default: null)

--parseExtraFields
                    Comma-separated list of meta-fields to be parsed

--pass, --input-pass, --output-pass
                    Pass phrase for the private key. Use --pass if source and destination are identical.
                    Otherwise, use the one prefixed with --input or --output as needed.

--quiet
                    Suppress all messages except for errors
                    (default: false)

--retryAttempts
                    Integer indicating the number of times a request should be automatically re-attempted before failing
                    when a connection fails with one of the following errors `ECONNRESET`, `ENOTFOUND`, `ESOCKETTIMEDOUT`,
                    ETIMEDOUT`, `ECONNREFUSED`, `EHOSTUNREACH`, `EPIPE`, `EAI_AGAIN`
                    (default: 0)

--retryDelay
                    Integer indicating the back-off/break period between retry attempts (milliseconds)
                    (default : 5000)

--retryDelayBase
                    The base number of milliseconds to use in the exponential backoff for operation retries. (s3)

--scroll-with-post
                    Use a HTTP POST method to perform scrolling instead of the default GET
                    (default: false)

--scrollId
                    The last scroll Id returned from elasticsearch.
                    This will allow dumps to be resumed used the last scroll Id &
                    `scrollTime` has not expired.

--scrollTime
                    Time the nodes will hold the requested search in order.
                    (default: 10m)

--searchBody
                    Preform a partial extract based on search results
                    when ES is the input, default values are
                      if ES > 5
                        `'{"query": { "match_all": {} }, "stored_fields": ["*"], "_source": true }'`
                      else
                        `'{"query": { "match_all": {} }, "fields": ["*"], "_source": true }'`
                    [As of 6.68.0] If the searchBody is preceded by a @ symbol, elasticdump will perform a file lookup
                    in the location specified. NB: File must contain valid JSON

--searchBodyTemplate
                    A method/function which can be called to the searchBody
                        doc.searchBody = { query: { match_all: {} }, stored_fields: [], _source: true };
                    May be used multiple times.
                    Additionally, searchBodyTemplate may be performed by a module. See [searchBody Template](#search-template) below.

--searchWithTemplate
                    Enable to use Search Template when using --searchBody
                    If using Search Template then searchBody has to consist of "id" field and "params" objects
                    If "size" field is defined within Search Template, it will be overridden by --size parameter
                    See https://www.elastic.co/guide/en/elasticsearch/reference/current/search-template.html for
                    further information
                    (default: false)

--size
                    How many objects to retrieve
                    (default: -1 -> no limit)

--skip-existing
                    Skips resource_already_exists_exception when enabled and exit with success
                    (default: false)

--sourceOnly
                    Output only the json contained within the document _source
                    Normal: {"_index":"","_type":"","_id":"", "_source":{SOURCE}}
                    sourceOnly: {SOURCE}
                    (default: false)

--support-big-int
                    Support big integer numbers

--templateRegex
                    Regex used to filter templates before passing to the output transport
                    (default: ((metrics|logs|\..+)(-.+)?)

--timeout
                    Integer containing the number of milliseconds to wait for
                    a request to respond before aborting the request. Passed
                    directly to the request library. Mostly used when you don't
                    care too much if you lose some data when importing
                    but would rather have speed.

--tlsAuth
                    Enable TLS X509 client authentication

--toLog
                    When using a custom outputTransport, should log lines
                    be appended to the output stream?
                    (default: true, except for `$`)

--transform
                    A method/function which can be called to modify documents
                    before writing to a destination. A global variable 'doc'
                    is available.
                    Example script for computing a new field 'f2' as doubled
                    value of field 'f1':
                        doc._source["f2"] = doc._source.f1 * 2;
                    May be used multiple times.
                    Additionally, transform may be performed by a module. See [Module Transform](#module-transform) below.

--type
                    What are we exporting?
                    (default: data, options: [index, settings, analyzer, data, mapping, policy, alias, template, component_template, index_template])

--versionType
                    Elasticsearch versioning types. Should be `internal`, `external`, `external_gte`, `force`.
                    NB : Type validation is handled by the bulk endpoint and not by elasticsearch-dump

--openSearchServerless
                    Set to true to run dump from AWS OpenSearch serverless collection.
                    (default : false)

AWS specific options
--------------------
--awsAccessKeyId and --awsSecretAccessKey
                    When using Amazon Elasticsearch Service protected by
                    AWS Identity and Access Management (IAM), provide
                    your Access Key ID and Secret Access Key.
                    --sessionToken can also be optionally provided if using temporary credentials

--awsChain
                    Use [standard](https://aws.amazon.com/blogs/security/a-new-and-standardized-way-to-manage-credentials-in-the-aws-sdks/)
                    location and ordering for resolving credentials including environment variables,
                    config files, EC2 and ECS metadata locations _Recommended option for use with AWS_

--awsIniFileName
                    Override the default aws ini file name when using --awsIniFileProfile
                    Filename is relative to ~/.aws/
                    (default: config)

--awsIniFileProfile
                    Alternative to --awsAccessKeyId and --awsSecretAccessKey,
                    loads credentials from a specified profile in aws ini file.
                    For greater flexibility, consider using --awsChain
                    and setting AWS_PROFILE and AWS_CONFIG_FILE
                    environment variables to override defaults if needed

--awsRegion
                    Sets the AWS region that the signature will be generated for
                    (default: calculated from hostname or host)

--awsService
                    Sets the AWS service that the signature will be generated for
                    (default: calculated from hostname or host)

--awsUrlRegex
                    Overrides the default regular expression that is used to validate AWS urls that should be signed
                    (default: ^https?:\/\/.*\.amazonaws\.com.*$)

--s3ACL
                    S3 ACL: private | public-read | public-read-write | authenticated-read | aws-exec-read |
                    bucket-owner-read | bucket-owner-full-control [default private]

--s3AccessKeyId
                    AWS access key ID

--s3SessionToken
                    AWS session token in case of using temporary credentials

--s3Compress
                    gzip data before sending to s3

--s3Configs
                    Set all s3 constructor configurations
                    A escaped JSON string or file can be supplied. File location must be prefixed with the @ symbol
                    (default: null)

--s3Endpoint
                    AWS endpoint that can be used for AWS compatible backends such as
                    OpenStack Swift and OpenStack Ceph

--s3ForcePathStyle
                    Force path style URLs for S3 objects [default false]

--s3Options
                    Set all s3 parameters shown here https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#createMultipartUpload-property
                    A escaped JSON string or file can be supplied. File location must be prefixed with the @ symbol
                    (default: null)

--s3Region
                    AWS region

--s3SSEKMSKeyId
                    KMS Id to be used with aws:kms uploads

--s3SSLEnabled
                    Use SSL to connect to AWS [default true]

--s3SecretAccessKey
                    AWS secret access key

--s3ServerSideEncryption
                    Enables encrypted uploads

--s3StorageClass
                    Set the Storage Class used for s3
                    (default: STANDARD)

Elasticsearch's Scroll API

Elasticsearch provides a scroll API to fetch all documents of an index starting from (and keeping) a consistent snapshot in time, which we use under the hood. This method is safe to use for large exports since it will maintain the result set in cache for the given period of time.

NOTE: only works for --output

Bypassing self-sign certificate errors

Set the environment NODE_TLS_REJECT_UNAUTHORIZED=0 before running elasticdump

# An alternative method of passing environment variables before execution
# NB : This only works with linux shells
NODE_TLS_REJECT_UNAUTHORIZED=0 elasticdump --input="https://localhost:9200" --output myfile

MultiElasticDump

This package also ships with a second binary, multielasticdump. This is a wrapper for the normal elasticdump binary, which provides a limited option set, but will run elasticdump in parallel across many indexes at once. It runs a process which forks into n (default your running host's # of CPUs) subprocesses running elasticdump.

The limited option set includes:

If the --direction is dump, which is the default, --input MUST be a URL for the base location of an ElasticSearch server (i.e. http://localhost:9200) and --output MUST be a directory. Each index that does match will have a data, mapping, and analyzer file created.

For loading files that you have dumped from multi-elasticsearch, --direction should be set to load, --input MUST be a directory of a multielasticsearch dump and --output MUST be a Elasticsearch server URL.

--parallel is how many forks should be run simultaneously and --match is used to filter which indexes should be dumped/loaded (regex).

--ignoreType allows a type to be ignored from the dump/load. Six options are supported. data,mapping,analyzer,alias,settings,template. Multi-type support is available, when used each type must be comma(,)-separated and interval allows control over the interval for spawning a dump/load for a new index. For small indices this can be set to 0 to reduce delays and optimize performance i.e analyzer,alias types are ignored by default

--includeType allows a type to be included in the dump/load. Six options are supported - data,mapping,analyzer,alias,settings,template.

--ignoreChildError allows multi-elasticdump to continue if a child throws an error.

--matchType allows multi-elasticdump to fetch indices from the specified elasticsearch endpoint. Two options are supported - alias,datastream

New options, --suffix allows you to add a suffix to the index name being created e.g. es6-${index} and --prefix allows you to add a prefix to the index name e.g. ${index}-backup-2018-03-13. --order accepts asc or desc and allows the indexes/aliases to be sorted before processing is performed

Usage Examples

# backup ES indices & all their type to the es_backup folder
multielasticdump \
  --direction=dump \
  --match='^.*$' \
  --input=http://production.es.com:9200 \
  --output=/tmp/es_backup

# Only backup ES indices ending with a prefix of `-index` (match regex). 
# Only the indices data will be backed up. All other types are ignored.
# NB: analyzer & alias types are ignored by default
multielasticdump \
  --direction=dump \
  --match='^.*-index$'\
  --input=http://production.es.com:9200 \
  --ignoreType='mapping,settings,template' \
  --output=/tmp/es_backup

Module Transform

When specifying the transform option, prefix the value with @ (a curl convention) to load the top-level function which is called with the document and the parsed arguments to the module.

Uses a pseudo-URL format to specify arguments to the module as follows. Given:

elasticdump --transform='@./transforms/my-transform?param1=value&param2=another-value'

with a module at ./transforms/my-transform.js with the following:

module.exports = function(doc, options) {
  // do something to doc
};

will load module ./transforms/my-transform.js, and execute the function with doc and options = {"param1": "value", "param2": "another-value"}.

An example transform for anonymizing data on-the-fly can be found in the transforms folder.

searchBody Template

When specifying the searchBodyTemplate option, prefix the value with @ (a curl convention) to load the top-level function which is called with the document and the parsed arguments to the module.

Uses a pseudo-URL format to specify arguments to the module as follows. Given:

elasticdump --searchBodyTemplate='@./templates/my-template?param1=value&param2=another-value'

with a module at ./transforms/my-transform.js with the following:

module.exports = function(doc, options) {
  // result must be added to doc.searchBody
  doc.searchBody = {}
};

will load module ./templates/my-template.js', and execute the function with docandoptions={"param1": "value", "param2": "another-value"}`.

An example template for modifying dates using a simple templating engine is available in the templates folder.

How Elasticdump handles Nested Data in CSV

Elasticdump is capable of reading/writing nested data, but in an _opinionated way. This is to reduce complexity while parsing/saving CSVs The format flattens all nesting to a single level (an example of this is shown below)

{
   "elasticdump":{
      "version":"6.51.0",
      "formats":[
         "json",
         "csv"
      ]
   },
   "contributors":[
      {
         "name":"ferron",
         "id":3
      }
   ],
   "year":112
}

Output format

{
  "elasticdump":"{\"version\":\"6.51.0\",\"formats\":[\"json\",\"csv\"]}",
  "contributors":"{\"contributors\":[{\"name\":\"ferron\",\"id\":3}]}",
  "year":2020
}

Notice that the data is flattened to 1 level. Object keys are used for headers and values as row data. This might not work with existing nested data formats, but that's the format that was chosen for elasticdump because of its simplicity. This detection is disabled by default, to enable use the --csvHandleNestedData flag

Notes

Articles on Elasticdump

Inspired by https://github.com/crate/elasticsearch-inout-plugin and https://github.com/jprante/elasticsearch-knapsack