[DOCS] Document time_series_metric mapping parameter

[jrodewig]

Documents the time_series_metric mapping parameter added with PR #76766.

Also renames the dimension parameter to time_series_dimension for PR #78012.

Previews

• aggregate_metric_double: https://elasticsearch_78013.docs-preview.app.elstc.co/guide/en/elasticsearch/reference/master/aggregate-metric-double.html#aggregate-metric-double-params

• histogram: https://elasticsearch_78013.docs-preview.app.elstc.co/guide/en/elasticsearch/reference/master/histogram.html#histogram-params

• Numeric field types: https://elasticsearch_78013.docs-preview.app.elstc.co/guide/en/elasticsearch/reference/master/number.html#number-params

• ip: https://elasticsearch_78013.docs-preview.app.elstc.co/guide/en/elasticsearch/reference/master/ip.html#ip-params

• keyword: https://elasticsearch_78013.docs-preview.app.elstc.co/guide/en/elasticsearch/reference/master/keyword.html#keyword-params

• Index settings: https://elasticsearch_78013.docs-preview.app.elstc.co/guide/en/elasticsearch/reference/master/index-modules.html#index-mapping-dimension-fields-limit

[elasticmachine]

Pinging @elastic/es-docs (Team:Docs)

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Pinging @elastic/es-analytics-geo (Team:Analytics)

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Pinging @elastic/es-search (Team:Search)

[jrodewig]

@elasticmachine update branch

[csoulios]

I left one comment for numeric fields.

Also, in PR #78012 I renamed dimension parameter to time_series_parameter. Not sure if you want to add this change in the same or a separate PR.

[csoulios]

I am not sure where the constraint that scaled_float and unsigned_long fields don't support this parameter comes from. There is no such constraint in the code. Am I missing something here?

[jrodewig]

During my testing, I wasn't able to create a scaled_float or unsigned_long field with the parameter. I assumed that was intended, but it may be a bug.

I opened #78100 for the bug report. I'll remove this sentence from the docs.

[csoulios]

Thank you for opening the issue. I will check that asap.

[jrodewig]

Thanks @csoulios. I made some additional changes related to PR #78012.

This is ready for another look at your convenience.

[csoulios]

Changes look good. I left some more comments.

[csoulios]

One last thing we should add is that a numeric field cannot be both a dimension and a metric.
I have added this constraint in #78204

[jrodewig]

Thanks @csoulios. I documented the constraint with 8354931. I also noted that unsigned_long fields can be a time series dimension.

Edit: Also pushed 2d24b30 for doc values for numeric metrics.

[csoulios]

LGTM. Thank you for iterating so fast on this!