Update a filed with script, there's error caused by "unsupported_operation_exception: null"

Elastic Stack Elasticsearch
1

using script update object field , unsupported_operation_exception occors.
elasticsearch version 7.10.

PUT script_test/
{
    "mappings" : {
      "dynamic" : "strict",
      "properties" : {
        "batch_name" : {
          "type" : "keyword"
        },
        "course_source_jx_cnt" : {
          "dynamic" : "true",
          "properties" : {
            "course_total_cnt" : {
              "type" : "long"
            }
          }
        }
      }
    },
    "settings" : {
      "number_of_shards": 4, 
      "number_of_replicas": 0,
      "refresh_interval": "20s"
    }
}

DELETE script_test/_doc/3

POST script_test/_create/3
{
  "batch_name" : "app_rby_landing_middle"
}

GET script_test/_doc/3

POST script_test/_update/3
{
  "script": {
    "lang": "painless",
    "source": "if(ctx._source.course_source_jx_cnt == null){ctx._source.course_source_jx_cnt = params.exam_answer_default;}  ctx._source.course_source_jx_cnt.course_total_cnt=params.course_total_cnt ", 
    "params": {"exam_answer_default":{}}
  }
}

errors:

{
  "error" : {
    "root_cause" : [
      {
        "type" : "illegal_argument_exception",
        "reason" : "failed to execute script"
      }
    ],
    "type" : "illegal_argument_exception",
    "reason" : "failed to execute script",
    "caused_by" : {
      "type" : "script_exception",
      "reason" : "runtime error",
      "script_stack" : [
        "java.base/java.util.AbstractMap.put(AbstractMap.java:209)",
        "ctx._source.course_source_jx_cnt.course_total_cnt=params.course_total_cnt ",
        "                                ^---- HERE"
      ],
      "script" : "if(ctx._source.course_source_jx_cnt == null){ctx._source.course_source_jx_cnt = params.exam_answer_default;}  ctx._source.course_source_jx_cnt.course_total_cnt=params.course_total_cnt ",
      "lang" : "painless",
      "position" : {
        "offset" : 142,
        "start" : 110,
        "end" : 184
      },
      "caused_by" : {
        "type" : "unsupported_operation_exception",
        "reason" : "unsupported_operation_exception: null"
      }
    }
  },
  "status" : 400
}
2

elasticsearch version 7.10 is EOL and no longer supported. Please upgrade ASAP.

(This is an automated response from your friendly Elastic bot. Please report this post if you have any suggestions or concerns :elasticheart: )

3

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