About the index that never becomes ENABLED and can't reindex the existent data, is because an example in documentation  (http://docs.janusgraph.org/latest/indexes.html) that create a index, wait for index to become available and try to reindex, wich cause an error, because the created index is not enabled never.

I think it's missing these line (in bold) inside documentation before the reindex. This is why I see other users had the same problem.

graph.tx().rollback() //Never create new indexes while a transaction is active
mgmt = graph.openManagement()
name = mgmt.getPropertyKey('name')
age = mgmt.getPropertyKey('age')
mgmt.buildIndex('byNameComposite', Vertex.class).addKey(name).buildCompositeIndex()
mgmt.buildIndex('byNameAndAgeComposite', Vertex.class).addKey(name).addKey(age).buildCompositeIndex()
mgmt.commit()
//Wait for the index to become available
mgmt.awaitGraphIndexStatus(graph, 'byNameComposite').call()
mgmt.awaitGraphIndexStatus(graph, 'byNameAndAgeComposite').call()
//Reindex the existing data
mgmt = graph.openManagement()
mgmt.updateIndex(mgmt.getGraphIndex("byNameComposite"), SchemaAction.ENABLE_INDEX).get()
mgmt.updateIndex(mgmt.getGraphIndex("byNameAndAgeComposite"), SchemaAction.ENABLE_INDEX).get()

 mgmt.updateIndex(mgmt.getGraphIndex("byNameComposite"), SchemaAction.REINDEX).get()
mgmt.updateIndex(mgmt.getGraphIndex("byNameAndAgeComposite"), SchemaAction.REINDEX).get()
mgmt.commit()

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