[TASK] transform fulltext scripting from mvel to groovy

Unfortunately you must now add the two lines
of Configuration which are mentioned in the README
to the elasticsearch.yaml
The default param of script.disable_dynamic is sandbox,
so the used class and methods in the script part 
must be whitelisted
[TASK] adding versioning to README
Merge pull request #34 from mgoldbeck/script-elastic130

[!!!][TASK]  Raise ElasticSearch Version Dependency to 1.2.0 - NEEDS ADDITIONAL CONFIGURATION of ElasticSearch

Please check the README to understand the relevant ElasticSearch configuration which needs to be done
in elasticsearch.yaml.