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# Index Service
The index service knows which document contains which keywords.
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## Central Classes
* [IndexService ](src/main/java/nu/marginalia/index/IndexService.java ) is the REST entry point that the internal API talks to.
* [IndexQueryService ](src/main/java/nu/marginalia/index/svc/IndexQueryService.java ) executes queries.
* [SearchIndex ](src/main/java/nu/marginalia/index/index/SearchIndex.java ) owns the state of the index and helps with building a query strategy from parameters.
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* [IndexResultValuator ](src/main/java/nu/marginalia/index/results/IndexResultValuator.java ) determines the best results.
## See Also
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The index service relies heavily on the primitives in [features-index ](../../features-index ):
* [features-index/index-forward ](../../features-index/index-forward/ )
* [features-index/index-reverse ](../../features-index/index-reverse/ )
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* [features-index/index-query ](../../features-index/index-query )
