The index server indexes and classifies documents and answers search queries. The processing takes place in the engines that belong to the index server. There are the following engines:
This engine is responsible for standard search functions such as exact, error-tolerant, linguistic, Boolean, and phrase searches.
This engine is responsible for classification, searching for similar documents ('See Also'search), the extraction of keywords, and so on.
This engine is responsible for searching in document properties such as author, creation date, change date, and so on.