Use the match_phrase property to run a match phrase query. The Search Service searches for exact matches to the phrase you specify.

Unlike a match query string, a match_phrase query string can contain spaces without using the operator property.

To use a match phrase query:
→You must specify a field to search with the field property or the {field-name} syntax in your search query.
→You must have Include Term Vectors enabled or the include_term_vectors property set to true on the field you want to
search.