title: Adding new custom field in kibana
body: <p>Is there a way to add a new field to all the documents in a index in kibana ? For example , lets assume, i have the age of all the users in my elastic kibana. And i want to separate them into two categories as <strong>Below 50 and Above 50</strong> . So if there is a user who is <strong>23 years</strong> of age , he should have a category value as <strong>Below 50</strong>.</p>