8941 adding file count in solr

[stevenferey]

What this PR does / why we need it:

Which issue(s) this PR closes:

• Closes fileCount in Solr Documents and API performance  #8941

Special notes for your reviewer:

Suggestions on how to test this:

Does this PR introduce a user interface change? If mockups are available, please link/include them here:

Is there a release notes update needed for this change?:

Additional documentation:

[scolapasta]

If you are still interested in this PR, can you please merge and resolve any merge conflicts with the latest from develop? If so, we can prioritize reviewing and QAing the changes. If we don’t hear from you by May 22, 2024, we’ll go ahead and close this PR (it can always be reopened after that date, if there is still interest).

[pdurbin]

If we don’t hear from you by May 22, 2024, we’ll go ahead and close this PR (it can always be reopened after that date, if there is still interest).

Closing.

[luddaniel]

Hello @scolapasta @pdurbin, for whatever reason we all did not receive notifications from this pull request. Sorry to have left your comments unanswered, this is not our way.
I recreated the PR (#10598) with more details in description (maybe the lack of description was the reason of low prioritizing).

[pdurbin]

@luddaniel thanks for the new PR! ❤️