Fields of type murmur3 dont appear in the lens fields list

[ebuildy]

Kibana version: 7.17.1

Elasticsearch version: 7.17.1 , with murmur3 plugin

Original install method (e.g. download page, yum, from source, etc.): Docker

Describe the bug:

Field with type murmur3 dont show up on Lens fields list. According here, https://github.com/elastic/kibana/blob/v8.1.1/x-pack/plugins/lens/public/indexpattern_datasource/datapanel.tsx#L70, the list seems hardcoded?

Steps to reproduce:

1. With plugin murmur3 installed, create elasticsearch index with following mapping:

token: {
  type: "keyword",
  fields: {
    hash: {
       type: "murmur3"
    }
  }
}

3. Create the kibana index pattern, the "token.hash" field is here
4. Go to Lens editor, field "token.hash" is missing

BTW the field appear on legacy aggregation visualization.

Expected behavior:

On Lens editor, field of type murmur3 should be present in the fields listing.

[elasticmachine]

Pinging @elastic/kibana-vis-editors @elastic/kibana-vis-editors-external (Team:VisEditors)

[flash1293]

You are correct, the shown field types in Lens are hardcoded and murmur3 is not part of them. Thanks for bringing up this use case, I will raise it with the team.

[ebuildy]

I am doing this PR, seems ok: main...ebuildy:patch-1 (not tested yet)

[flash1293]

@ebuildy Awesome, thanks for that! If you open a PR against elastic/kibana I can check it out. I guess one problem will be that there's no icon for it, but I'm sure we will find a solution