Set to true to lower case all words first. Defaults to false.

Set to false in order to not ignore the last term of a search if it is a stop word. This is very useful for the completion suggester as a query like green a can be extended to green apple even though you remove stop words in general. Defaults to true.

A list of stop words to use. Defaults to `_english_` stop words.

A path (either relative to config location, or absolute) to a stopwords file configuration. Each stop word should be in its own "line" (separated by a line break). The file must be UTF-8 encoded.