[ML][Maps] Add show-in-maps button to ML UX

[thomasneirynck]

When anomalies have a spatial component (e.g. geo_point or geo_shape), consider the possibility of adding a button to the job results (and potentially datatransform). Pressing this button would open the Maps app with a map of the ML-job (with separate layers showing anomalies, reference values, ...)

It behave similar to the "visualize" buttons in Discover when geo_point or geo_shape fields are detected.

This would automate a common manual workflow.

There were some lower-level efforts that likely make this possible, specifically the addition of multi-layer templates: #67544

Similarly, Maps could add a "ML" layer-wizard in Maps itself. If Maps detects an ML-index pattern with geo-fields, Maps can provide a layer-template shortcut (similar to Observability or Security layers).

See also #59659

cc @benwtrent @nreese @jsanz @alvarezmelissa87

[elasticmachine]

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

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[thomasneirynck]

This ended up taking a slightly different direction:

As a first step, maps are now (7.12 and up) embedded inside the anomaly-explorer application, to show maps with anomaly data: #88416

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Next steps:

Investigate further, on how to add this hotlinking experience between ML-Maps. This will require Maps to allow interfacing with data which are not index patterns, in this case the internal ml-anomaly-index, which has a custom API.

• This custom interface would require some trade-offs wrt querying/filtering in Maps: ie. the global query/filter bar in the Maps-application only works for data backed by index-patterns. This ML-layer would not be queryable/fitlerable as a result.
• Maps-team also should explore whether it is possible for external plugins to register custom data sources (e.g. an anomaly-data-source) to the Maps-plugin at bootstrap time. This would enable ML team to own the code and domain-knowledge in how to translate anomaly-data into a map-layer inside the ML-plugin.

[thomasneirynck]

update: created #90497 as a POC on how ML-plugin could register a new source-type with the Maps-plugin. to be discussed. Will add more detailed description in that PR.

[thomasneirynck]

Closed by #128697