Yes you are correct, all my string fields are not_analyzed
Very strange whats the point of checking regular expression in analyzed fields as it will breakdown the words like "foo bar" into "foo" and "bar". So no need of regular expression
The whole concept of Elastic is rely on search engine and if we cannot use regular expression on a set of string fields then i think whole concept of ES is gone for a toss.
I am just hitting the basics here.....
Anyways thanks for your help...
Regards
Ritesh