Adding synonym sets removes search results for fully localized entities when searching with stop words

• Type: Bug
• Status: Verified
• Resolution: Unresolved
• Affects Version/s: 7.2.X, Master
• Fix Version/s: None
• Component/s: Search Tuning > Synonyms
• Labels:
  • 7.2-sp1-known-issues
  • 7.3-known-issues
  • liferay-ga4-ce-733
  • liferay-ga5-ce-734
  • liferay-ga6-ce-735
  • liferay-ga7-ce-736
  • liferay-ga8-ce-737
  • reviewed-by-pm
• Epic/Theme:
  • Search_Tech_Debt
• Fix Priority: 4

Steps to reproduce:

1. Create two Web Content Articles titled: thing with words, for you
2. On the home page, search for thing with words, then search for for you
   Observed behavior: The web content articles appear in the search results for their respective queries.
3. Add a new Search Tuning > Synonym Set: thing with words, phrase
4. Add another Synonym Set: for you, letter
5. On the home page, search for thing
   Observed behavior: The web content article thing with words appears in the search results.
6. Search for thing with words, then search for phrase
   Expected result: The web content article thing with words appears in both search results.
   Actual result: Nothing is returned in both search results.
7. Search for for you, then search for letter
   Expected result: The web content article for you appears in both search results.
   Actual result: Nothing is returned in both search results.

Note: This is reproducible using Categories as well which is another fully localized entity. This is NOT reproducible for non-localized entities (e.g. Documents and Media, Blogs, Message Boards, etc)

Reproduced on:
Portal master Git commit: 5768543decf42efba87f23f0bc6a08f4152cd1a7
Portal 7.2.x Git commit: 6eaecf2e61368116b25d3c678b286cfbd26aa4dc