content based searching in files

[sahas]

Hi All,

I am new to elasticsearch framework. I am working on file search engine functionality.
I have to implement content based searching for .txt and word files.
I am able to search the file based on content when i store content of file in index. However , this does not look very efficient way to me.
Please let me know how can i enable content based searching without storing content of file in index.

Regards,
Sahas