Template editor adds all default settings for mapping when editing.

[PhaedrusTheGreek]

Kibana version: 7.11.2

Elasticsearch version: 7.11.2

Server OS version: Elastic Cloud

Browser version: Chrome

Browser OS version: Mac OS

Describe the bug:

When editing an index template, I changed the name of one of the fields from path to tags and all default values were inserted:

"commentable": {
      "type": "object",
      "properties": {
        "namespace": {
          "type": "keyword"
        },
        "tags": {
          "eager_global_ordinals": false,
          "norms": false,
          "index": true,
          "store": false,
          "type": "keyword",
          "split_queries_on_whitespace": false,
          "index_options": "docs",
          "doc_values": true
        }
      }
    },

This will be hazardous and unexpected, moving forward across major versions. Settings will be deprecated, and/or default behaviours may be modified.

[elasticmachine]

Pinging @elastic/kibana-stack-management (Team:Stack Management)

[alisonelizabeth]

Possibly related to #52708.

[cjcenizal]

I agree with Alison, this is caused by the issue she linked above. I was able to reproduce this on 7.14.

[ElenaStoeva]

A short term-solution proposed in #52708 (comment) was implemented in #152730. We decided to defer the implementation of a long-term solution until later as this is not of highest priority at the moment.

[Oddly]

I think this should get a + on a priority scale, this is breaking people's ECS and introducing conflicts, which should be avoided at all costs.

See related issue:
#150395