Since Elasticsearch 6.0.0 offsets must not go backwards

[orangemi]

since Elasticsearch 6.0.0, startOffset must be non-negative, and endOffset must be >= startOffset, and offsets must not go backwards.

That means startOffsets should be always greater than before. Although Chinese word token can be divided into servial token due to ambiguity like "中国人" can be tokenized "中国"+"人" & "中国人"

Origin Error:

    {
      "error": {
        "root_cause": [
          {
            "type": "remote_transport_exception",
            "reason": "[4YKGDw9][192.168.0.21:9305][indices:data/write/update[s]]"
          }
        ],
        "type": "illegal_argument_exception",
        "reason": "startOffset must be non-negative, and endOffset must be >= startOffset, and offsets must not go backwards startOffset=0,endOffset=3,lastStartOffset=1 for field 'description'"
      },
      "status": 400
    }

One of solution metioned below:
hankcs/hanlp-lucene-plugin#27 (comment)
hankcs/hanlp-lucene-plugin@eebea90

And origin issue reference:
sing1ee#9