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CountQuery

CountQuery returns only the number of matching documents.

When to use it

Use CountQuery when the caller needs cardinality without fetching documents:

var scienceFictionCount = await index.CountAsync(
    new CountQuery(Filter.Tag("genre").Eq("science-fiction")));

The canonical runnable reference is /examples/JsonStorageExample.

Behavior

CountQuery accepts an optional FilterExpression:

  • new CountQuery() counts every indexed document

  • new CountQuery(filter) reuses the same filter DSL as FilterQuery

  • the result is a long

Internally the library issues an FT.SEARCH count-only request, so use CountQuery instead of a search with limit: 0 when the API contract you want is "count only".

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