commit docs on core search components, re #429

[whatisgalen]

brief description of changes

issues addressed

429

further comments

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This box must be checked

• [ ] the PR branch was originally made from the base branch

This box should be checked

• [ ] after these changes the docs build locally without error

This box should only be checked you intend to follow through on it (we can do it on our end too)

• [ ] I will cherry-pick all commits in this PR into other branches that should have them after this PR is merged

[ekansa]

@whatisgalen does this apply to v7.5 (earlier too) or only the upcoming v7.6?

[ekansa]

@whatisgalen just checking to see if you need any help or clarification with my review request!

[ekansa]

I'm going to merge this! Thanks for the help @whatisgalen !