How to find out which array element is matched in Elastic Search?

Question

elasticsearch

Among documents successfully I do search in an array "names".

Question: how to understand which of the elements is matched inside the score-function? Index or string value.

Document:

{
  "names": [
    { "name_norm": "redone" },
    { "name_norm": "purpleone" }
  ]
}

Search:

POST /named_index/named/_search?pretty=true&explain=true

{
  "query": {
    "function_score": {
      "query": {
        "regexp": {
          "names.name_norm": {"value": "purpleone"}
        }
      },
      "script_score": {
        "script": {
          "source": "100.0"
        }}}}}

Complete: https://gist.github.com/zencd/f17943c2af89b9b6de02...

Answer 1

Matched string:
{"source": "doc['names.name_norm'].value"}
Its length:

{"source": "doc['names.name_norm'].value.length()"}