After install 2 apm 7.16.2 version to each es, I found difference

[badtimo]

Kibana version:
7.16.2

Elasticsearch version:
7.16.2

APM Server version:
7.16.2

APM Agent language and version:
golang, 1.15

Browser version:
chrome 96.0.4664.110

Original install method (e.g. download page, yum, deb, from source, etc.) and version:
helm chart

Fresh install or upgraded from other version?
upgrade from 7.9.1

Is there anything special in your setup? For example, are you using the Logstash or Kafka outputs? Are you using a load balancer in front of the APM Servers? Have you changed index pattern, generated custom templates, changed agent configuration etc.
nop

Description of the problem including expected versus actual behavior. Please include screenshots (if relevant):

found difference

OK es.

GET apm-*/_mapping/field/service.name
{
  "apm-7.16.2-onboarding-2021.12.27" : {
    "mappings" : {
      "service.name" : {
        "full_name" : "service.name",
        "mapping" : {
          "name" : {
            "type" : "keyword",
            "ignore_above" : 1024
          }
        }
      }
    }
  },
  "apm-7.16.2-transaction-000001" : {
    "mappings" : {
      "service.name" : {
        "full_name" : "service.name",
        "mapping" : {
          "name" : {
            "type" : "keyword",
            "ignore_above" : 1024
          }
        }
      }
    }
  },

KO es.

GET apm-*/_mapping/field/service.name
{
  "apm-7.16.2-transaction-000001" : {
    "mappings" : {
      "service.name" : {
        "full_name" : "service.name",
        "mapping" : {
          "name" : {
            "type" : "text",
            "fields" : {
              "keyword" : {
                "type" : "keyword",
                "ignore_above" : 256
              }
            }
          }
        }
      }
    }
  },
  "apm-7.16.2-onboarding-2021.12.28" : {
    "mappings" : { }
  },
  "apm-7.16.2-error-000001" : {
    "mappings" : {
      "service.name" : {
        "full_name" : "service.name",
        "mapping" : {
          "name" : {
            "type" : "text",
            "fields" : {
              "keyword" : {
                "type" : "keyword",
                "ignore_above" : 256
              }
            }
          }
        }
      }
    }
  },

Steps to reproduce:

1. just uninstall apm server and agent 7.9.1 (helm)
2. and reinstall apm server 7.16.2 with helm chart

Errors in browser console (if relevant):

Provide logs and/or server output (if relevant):

I wan't how to fix old apm index/templete.

Thanks for reading.