Use the Search() extension method to perform a full-text search on a particular field. Search() accepts a string containing
the desired search terms separated by spaces. These search terms are matched with the terms in the index being queried.
As of v4.2 you can also pass an array of the search terms.
An index's terms are derived from the values of the documents' fields. These values were each converted into one or more terms
depending on which Lucene analyzer the index used.
Points index field that should be used for querying.
string (or IEnumerable<string>)
A string of the desired search terms separated by spaces (i.e. to search for "john" or "jack", pass the string "john jack"). Alternatively, you can pass an array (or other IEnumerable) of search terms. Wildcards can be used: ? for any single character, * for any substring.