When we reindex from ES2 to ES6, get error :Remote responded with a chunk that was too large. Use a smaller batch size

Elastic Stack Elasticsearch
1

when we reindex get error,the detail info as flow:
{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"Remote responded with a chunk that was too large. Use a smaller batch size."}],"type":"illegal_argument_exception","reason":"Remote responded with a chunk that was too large. Use a smaller batch size.","caused_by":{"type":"content_too_long_exception","reason":"entity content is too long [123362947] for the configured buffer limit [104857600]"}},"status":400}

ES version: 2.4.0 6.2.4
data store: 10TB
documents number: 100 million

redindex API:
curl -X POST "localhost:9200/_reindex" -H 'Content-Type: application/json' -d'
{
"source": {
"remote": {
"host": "http://192.168.10.87:9200"
},
"index": "test"
},
"dest": {
"index": "test2"
}
}'

2

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