Some words in a node are not found, others are

Huh, that is indeed very strange behavior and I don’t have any quick suggestions here for you.
(Unless you maybe have the “Stopwords” processor enabled and “angstel“ and “baambrugge” are in there?)

It’s unfortunately not very convenient to inspect the contents of a Database Search index, but here is how to do it:

1. Go into your database.
2. There should be a table search_api_db_[INDEX_NAME]_text.
3. Filter that table by the item in question, something like WHERE item_id = 'entity:node/[NID]:nl'.
4. The result will list all indexed words for that item in the word column. Look for “angstel” or something similar there. If it isn’t there, then something removes that word from indexing for some reason. If it is there but maybe looks a bit off that’s another thing to worry about, but in this case the problem is probably at search time.

Hi,
Thansk for the tip to look into the database. I will do that in the upcoming days. I had to move on with the website so I reverted back to the default Search module and used the Content Exclude module to disable some content types from being indexed.

The words I mentioned are not in the stopwords list so I will check if they are in the database when I am going to do maintenance and try to implement search API again.