Bump elasticsearch to 1.2.1, lucene to 4.8.1, spatial4j to 0.4.1

Note this explicitly enables dynamic scripting, which was disabled
in ElasticSearch 1.2.0. This is needed in order to remove fields.
The reasoning behind this change can be found in
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-scripting.html#_enabling_dynamic_scripting.
Merge pull request #664 from Lab41/es-1.2.1

Bump ElasticSearch to 1.2.1, Lucene to 4.8.1