Update to ElasticSearch 0.90.0.Beta1
Remove old unused duplicated classes
Minor code cleanups
Remove WeakReference for unwrappers
ElasticSearch integration test
Javadoc fix

javadoc still complains about some obscure annotation I do not use
directly...

    [WARNING] com.sun.tools.javac.code.Symbol$CompletionFailure: class file for javax.annotation.ParametersAreNonnullByDefault not found
    [WARNING] javadoc: warning - Class javax.annotation.ParametersAreNonnullByDefault not found.
Fix tag name during maven release
Update version in README
[maven-release-plugin] prepare release v1.3.0