[TASK] Add functional tests for indexed_search

Added tests for:
- indexing contents and words
- a basic search
- metaphone search

Resolves: #97732
Releases: main, 11.5, 10.4
Change-Id: Id56e09f129de4bd13092f584e97eedc9fd326b5c
210 jobs for main.74814.6 in 20 minutes and 40 seconds (queued for 59 seconds)
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