[Lens] Count Function Doesn't Support the Histogram Field Type Although ES Does

[psypuff]

Kibana version:
8.15.0

Elasticsearch version:
8.15.0

Server OS version:
Amazon Linux 2.0.20240816.0

Browser version:
Chrome 128.0.6613.84 (Official Build) (arm64)

Browser OS version:
MacOS 14.5

Original install method (e.g. download page, yum, from source, etc.):
ECK 2.14

Describe the bug:
While plotting a histogram field using Lens, the Count function reverts to count records and the field becomes greyed-out. Also, the count() formula spits a Field <field_name> is of the wrong type warning when trying to use it on a histogram field.

Steps to reproduce:

1. Create a new Lens visualization
2. Drag and drop a histogram field onto the graph
3. Change the function to Count

Or

1. Create a new Lens visualization
2. Add a vertical axis item
3. Switch to formula
4. Use the count() formula on a histogram field

Expected behavior:
Since Kibana supports the values_count aggregation under the count() formula and Elasticsearch supports histogram fields in the values_count aggregation for a few years now - Kibana is also expected to support counting histogram fields using Lens.

Screenshots (if relevant):

Errors in browser console (if relevant):

Provide logs and/or server output (if relevant):

Any additional context:
It seems the histogram is just missing from this list but I'm not familiar with the code and there might be more to it.

[elasticmachine]

Pinging @elastic/kibana-visualizations (Team:Visualizations)