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bigram_freq_words
A list of keywords considered “frequent” when indexing bigrams. Optional, default is empty. Added in 2.1.1-beta.
Bigram indexing is a feature to accelerate phrase searches. When indexing, it stores a document list for either all or some of the adjacent words pairs into the index. Such a list can then be used at searching time to significantly accelerate phrase or sub-phrase matching.
Some of the bigram indexing modes (see the section called “bigram_index”) require to define a list of frequent keywords. These are not to be confused with stopwords! Stopwords are completely eliminated when both indexing and searching. Frequent keywords are only used by bigrams to determine whether to index a current word pair or not.
bigram_freq_words lets you define a list of such keywords.
Example:
bigram_freq_words = the, a, you, i
