title: Solr field alias for indexing and querying
body: <p>I have a set of documents in a Solr index that have the fields, exact_title and alternative_title. I want to be able to search them by using the field title.
  So in other words the query <code>title:Hello World</code> should return documents that have an exact_title or an alternative_title "Hello World" </p>
  
  <p>Is it possible to define as alias for a field during indexing time?</p>