[Bug][Connector-V2][ES]Fix es source no data

[kpretty]

Purpose of this pull request

repair the index of complex mapping, the data cannot be obtained through the form of a.b
For example
index of mapping

{
  "arkime_sessions3-221123": {
    "mappings": {
      "properties": {
        "@timestamp": {
          "type": "date"
        },
        "@version": {
          "type": "text",
          "fields": {
            "keyword": {
              "type": "keyword",
              "ignore_above": 256
            }
          }
        },
        "agent": {
          "properties": {
            "build": {
              "properties": {
                "original": {
                  "type": "keyword",
                  "ignore_above": 1024
                }
              }
            },
            "ephemeral_id": {
              "type": "keyword",
              "ignore_above": 1024
            },
            "id": {
              "type": "keyword",
              "ignore_above": 1024
            },
            "name": {
              "type": "keyword",
              "ignore_above": 1024
            },
            "type": {
              "type": "keyword",
              "ignore_above": 1024
            },
            "version": {
              "type": "keyword",
              "ignore_above": 1024
            }
          }
        }
      }
    }
  }
}

The current code configuration is as follows: no data can be obtained

source = ["agent.name"]

This PR fixes this bug

Check list

• Code changed are covered with tests, or it does not need tests for reason:
• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/incubator-seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update change log that in connector document. For more details you can refer to connector-v2
  2. Update plugin-mapping.properties and add new connector information in it
  3. Update the pom file of seatunnel-dist
• Update the release-note.

[hailin0]

remove

[kpretty]

useless code removed

[TyrantLucifer]

LGTM