Potential breaking changes in 0.2.0


I add this thread to discuss about breaking change in 0.2.0 with this PR https://github.com/JanusGraph/janusgraph/pull/336.

This PR add a breaking change for Elasticsearch backend because it Elasticsearch split index into N indexes.
To deals with this, we have three options :
  1.  0.2.0 is not compatible with 0.1.x
  2. We create a script to migrate index.
  3. We make the configuration switch.
Between 2 and 3, I prefer 2 because I would like to add a delete method by index to solve https://github.com/JanusGraph/janusgraph/issues/354 and to remove this https://github.com/JanusGraph/janusgraph/blob/master/janusgraph-core/src/main/java/org/janusgraph/graphdb/olap/job/IndexRemoveJob.java#L105

But, for me 0.2.0 is already not compatible with 0.1.x because Geoshape serialization (https://github.com/JanusGraph/janusgraph/blob/master/janusgraph-core/src/main/java/org/janusgraph/core/attribute/Geoshape.java#L542).
In 0.1.x Geoshape serialization was en tab of float, in 0.2.0 JanusGraph use JtsBinaryCodec. So a geoshape serializes in 0.1.x can not be read by 0.2.0. 

What do you think ?

I did not know if there are any other breaking change.


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