Updating Index Analysis

I am really new to Elasticsearch and gaining the knowledge from documentation. So far everything is fine.

I would like to know what modifications that we can do for "Analysis" section in an existing "Index Settings". (Other than adding a new analyzer)

I referred to "Updating Index Analysis" section too

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/indices-update-settings.html#update-settings-analysis




Thanks


Duleendra