About Dictionaries

All these resources are already configured for the default dictionary, dict0. Use this list to change default settings or to build new dictionaries.

Resource	Description
Words	Stores words & their frequency to calculate relevance and term expansion. If word occurrences are under the specified Min Frequency, they do not appear in the dictionary.
Ngrams	Used to improve spell check accuracy. PREREQUISITE: Select the Extract spell check ngrams for the semantic types associated with this dictionary.
Phonetic Forms	Used to improve spell check accuracy, to calculate relevance and term expansion. It is required for phonetic term expansion. PREREQUISITE: a phonetic semantic processor must be defined in the pipeline, or you must select the Extract phonetic forms option for the semantic types associated with this dictionary.
Related Terms	Required to provide related terms in this language. PREREQUISITE: Define a related terms semantic processor in the pipeline.

Exalead CloudView supports multiple dictionaries. Each dictionary is configured separately with its own name, maximum size, and so forth.

• On the indexing side, you can configure a semantic type to use a specific dictionary. So when you associate a data model property with a semantic type, it ensures that the generated index field is associated to a specific dictionary. This dictionary can only contain words likely to appear in that field.

• Symmetrically, each prefix-handler at search time can target a specific dictionary (for regexp search, etc.).

Moreover, the dictionary allows you to define filtering rules for controlling which words are stored in the dictionary. This allows you to store only words with a minimum number of characters, or words matching a regular expression.