go install github.com/codenoid/elastis@main

$ elastis --help-long
usage: elastis.exe --pass=PASS --index=INDEX [<flags>] <command> [<args> ...]

Flags:
  --[no-]help                    Show context-sensitive help (also try
                                 --help-long and --help-man).
  --url="http://localhost:9200"  Elasticsearch URL ($ES_URL)
  --user="elastic"               Elasticsearch user ($ES_USER)
  --pass=PASS                    Elasticsearch password ($ES_PASS)
  --index=INDEX                  Elasticsearch index ($ES_INDEX)
  --file-format="csv"            csv (default) for flat structure/more space
                                 efficient, msgpack for inconsistent/complex
                                 document. ($FILE_FORMAT)
  --ignore-field=IGNORE-FIELD ...
                                 Ignore field when importing data, separated by
                                 comma ($IGNORE_FIELD)

Commands:
help [<command>...]
    Show help.


export [<flags>]
    Export Elasticsearch index to a file

    --batch-size=1000  Elasticsearch export/dump batch size ($ES_BATCH_SIZE)
    --output="esdump"  Output file, used for export/dump ($OUTPUT_FILE)

import [<flags>]
    Import Elasticsearch index from a file

    --input=INPUT        Input file, used for import ($INPUT_FILE)
    --[no-]create-index  Create index before importing data ($CREATE_INDEX)