Analysis API with explain fails to parse "attributes" from plugin-installed analyzer

[SunnyBo0302]

With nori_analyzer,

request

GET _analyze
{
    "analyzer": "nori",
    "text": "abc",
    "explain": true
}

response

{
    "detail": {
        "custom_analyzer": false,
        "analyzer": {
            "name": null,
            "tokens": [
                {
                    "token": "abc",
                    "start_offset": 0,
                    "end_offset": 3,
                    "type": "word",
                    "position": 0,
                    "bytes": "[61 62 63]",
                    "leftPOS": "SL(Foreign language)",
                    "morphemes": null,
                    "posType": "MORPHEME",
                    "positionLength": 1,
                    "reading": null,
                    "rightPOS": "SL(Foreign language)",
                    "termFrequency": 1
                }
            ]
        }
    }
}

Using analyze API provided in ElasticsearchIndicesAsyncClient.java

request

AnalyzeRequest analyzeRequest = new AnalyzeRequest.Builder()
          .analyzer("nori")
          .text("abc")
          .index(MY_INDEX)
          .explain(true)
          .build();

Since there is no such variable "attributes" in ExplainAnalyzeToken.java which was present in RHLC AnalyzeResponse.java,
there is no way to retrieve response values "posType", "rightPOS" ,... and etc.

[swallez]

This has been fixed in PR #292, backported to version 8.2 in PR #293 and to version 7.17 in PR #294.