[Maps] Fix geo alerts handling of multi-fields

[kindsun]

Fixes #100330. Prior to this fix, index pattern fields were screened only for field format. This PR adds a check for aggregatability and ignores fields that can't be aggregated in multi-fields and otherwise

Future work could explore support for multi-fields but for now it makes more sense to prevent users from leveraging unsupported capabilities.

Before fix:

After fix:

[elasticmachine]

Pinging @elastic/kibana-gis (Team:Geo)

[kindsun]

Tested locally using a modified version of https://github.com/thomasneirynck/faketracks containing a multi-field for the entity id. Here were the mappings used for this field:

"entity_id": {
    "type": "text",
    "fields": {
        "raw": {
            "type":  "keyword"
        }
    }
},

The primary issue wasn't actually a field being a multi-field, but instead was aggragateability. For instance, in the case above, both entity_id and entity_id.raw are fields. entity_id.raw is aggragateable and a multi-field and works as expected, whereas entity_id, which is neither, doesn't.

[thomasneirynck]

Can you add snapshot test for this component ? Should probably show the filtering in action (I think).

tested, filters out the non-aggregatable text-fields.

e.g.:

     "ephemeral_id" : {
              "type" : "text",
              "fields" : {
                "keyword" : {
                  "type" : "keyword",
                  "ignore_above" : 256
                }
              }
            },

[thomasneirynck]

remove the 7.12.2 label since we won't have a 7.12.2 release (at least. as it stands now).

I'd try to add test-coverage, given we are patching a release.

[thomasneirynck]

this will not make 7.13.1, moving to 7.13.2

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: a276cfc
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Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
stackAlerts	662.9KB	663.1KB	+187.0B

Unknown metric groups

References to deprecated APIs

id	before	after	diff
stackAlerts	101	104	+3

History

• 💚 Build #131078 succeeded 0086091
• 💔 Build #126630 failed 8118296
• 💔 Build #126595 failed 7985779
• 💔 Build #126571 failed 48275f2

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[thomasneirynck]

@aaronjcaldwell Could you backport to 7.13 as well? There will be another patch for the 7.13 as well. Added 7.13.3 label.