title: Azure Search Service documents fields verses Index fields
body: <p>I am trying to understand how Azure Search Service works.  If you have a comma delimited file that contains 4 fields, do you have to create an Index that contains all four fields?  If you don't care about one of the fields in the comma delimited file, can you just not include it in the Index definition?  When you upload the data (using code) will Azure Search Service just ignore the additional field, throw an error, or create a new field in the index?</p>