I am using Azure.search.mocument.models.SearchOptions and I’m trying to set the filter to not(answer in ('X', 'Y')). So it looks like this:

SearchOptions searchOptions = new SearchOptions()
    .setFilter("not(answer in ('X', 'Y')");

What I’ve tried:

• not answer in (‘X’, ‘Y’)
• not(answer in (‘X’, ‘Y’)
• answer nin (‘X’, ‘Y’)

Also, .setFilter("answer eq 'X') works just fine.

I get this error when doing the first two filters (not the “nin” one):

Invalid expression: Expression contains an unsupported OData language feature.

But in the Azure Search documentation, it says that “not” is supported: https://learn.microsoft.com/en-us/azure/search/search-query-odata-logical-operators

Is there any way I can do a “not in” expression rather than doing an answer ne X and answer ne Y filter?