Changes search index

[gerdos82]

Description

• Only suggest in tsvector, not display_name.
• Switch to simple dictionary instead of dutch dictionary. The dutch dictionary is to limited for our use case. For instance Fries is not supported. In some cases the dutch dictionary is used for diacritics and in some cases the custom synonyms functionality. This gives inconsistent results for highlighting.

Type of change

• Improvement of existing feature
• Bugfix

Checklist:

• I've double-checked the code in this PR myself
• I've left the code better than before (boy scout rule)
• The code is readable, comments are added that explain hard or non-obvious parts.
• I've expanded/improved the (unit) tests, when applicable
• I've run (unit) tests that prove my solution works
• There's no sensitive information like credentials in my PR