SearchDocumentInterface

get_document_count_by_search(string $searchterm, null $instance_id = NULL, int $post_type = -1, array $limit = [], array $advanced_options = [], array $facetted_search = [])

Gets the maximum available hits count for this search-term

get_documents_by_search($searchterm, string $instance_id = NULL, int $post_type = -1, array $limit = [], array $advanced_options = [], array $facetted_search = [], Term $term = NULL)

Search for "Documents"

get_facetted_search_info()

Returns facet search data based on the last search query.

get_min_length()

Returns the min length of a single search word

get_searchterm_suggest(string $q)

Function will return suggestions based on input usually spell corrected or similar queries (Did you mean ...)