Exposed Filter Fulltext Search having the Searched fields as options along with the text box
I found a work around for this. We can create a radio button list in hook_form_alter() having the searched fields. Using hook_search_api_views_query_alter(), we can alter the fields that are passed in the $query object, so that the result set is returned only for the field that is been searched.

function MYMODULE_search_api_views_query_alter(&amp;$view, &amp;$query) {
    if(isset($_GET['your_field_name'])) {
        switch($_GET['your_field_name']) {
            case 'field1':              
                $fields = $query-&gt;getFields();
                $fields = array( 0 =&gt; 'field1_value');          
                $query-&gt;fields($fields);
            break;
            .....
            .....
          }
        }
      }