Encoded bytes are incorrect length issue

[Akaren]

Hi, my elasticsearch 7.7.1 sometimes returns encoded bytes are incorrect length error with 400. It's only sometimes, can you tell me the meaning? What can be couse of it?

[warkolm (Mark Walkom)]

Can you provide a bit more information please.
What is the full error? Is there anything in the Elasticsearch logs? What client is receiving this error?

[Akaren]

Elastic log doesn't how anything. I am using elasticsearch-js client and that returns

Error: [illegal_argument_exception] encoded bytes are of incorrect length
Jan  6 01:55:35: at respond (/node_modules/elasticsearch/src/lib/transport.js:308:15)
Jan  6 01:55:35: at checkRespForFailure (/node_modules/elasticsearch/src/lib/transport.js:267:7)
Jan  6 01:55:35: at HttpConnector.<anonymous> (/node_modules/elasticsearch/src/lib/connectors/http.js:166:7)
Jan  6 01:55:35: at IncomingMessage.wrapper (/node_modules/lodash/lodash.js:4929:19)
Jan  6 01:55:35: at emitNone (events.js:111:20)
Jan  6 01:55:35: at IncomingMessage.emit (events.js:208:7)
Jan  6 01:55:35: at endReadableNT (_stream_readable.js:1055:12)
Jan  6 01:55:35: at _combinedTickCallback (internal/process/next_tick.js:138:11)
Jan  6 01:55:35: at process._tickCallback (internal/process/next_tick.js:180:9)