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**Supported function named parameters**

`zero_terms_query`
:   (keyword) Indicates whether all documents or none are returned if the analyzer removes all tokens, such as when using a stop filter. Defaults to none.

`boost`
:   (float) Floating point number used to decrease or increase the relevance scores of the query. Defaults to 1.0.

`analyzer`
:   (keyword) Analyzer used to convert the text in the query value into token. Defaults to the index-time analyzer mapped for the field. If no analyzer is mapped, the index’s default analyzer is used.

`slop`
:   (integer) Maximum number of positions allowed between matching tokens. Defaults to 0. Transposed terms have a slop of 2.