Updating analyzer within ElasticSearch settings
Short answer: No.
Longer answer. From the ES docs:
"Although you can add new types to an index, or add new fields to a type, you can’t add new analyzers or make changes to existing fields. If you were to do so, the data that had already been indexed would be incorrect and your searches would no longer work as expected."
Best way is to create a new index, and move your data. Some clients have helpers to do this for you, but it's not part of the standard Java client.
http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/reindex.html