The cores services constitute the main functionality of the search engine, relatively agnostic to the Marginalia application.
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The index-service contains the indexes, it answers questions about which documents contain which terms.
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The query-service Interprets queries and delegates work to index-service.
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The control-service provides an operator's user interface, and is responsible for orchestrating the various processes of the system.
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The assistant-service helps the search service with spelling suggestions other peripheral functionality.