Use GraphAware TX API + Shell command for index import

[jazzido]

Hey @jexp,

There's two major changes in this PR:

• I'm now using @graphaware framework for implementing the transaction change listener.
• Initial version of a shell command for importing nodes into an ElasticSearch index ((Re)indexing tool #7)

Cheers,

M

[jexp]

I'd rather not pull in an external dependency at this point, as I think this should stay a minimal demonstration on how to achieve this kind of integration.

But if you think this makes sense, I'm more than happy to link your fork from the developer pages too as one example how to take this further.

What do you think?

[jazzido]

Sure. I'm willing to maintain my fork, as I'm using this in production and not merely as a demonstration.
I also tried to avoid introducing a new dependency, but @graphaware's improved transaction classes allowed me to track node changes in the transaction handler without writing a lot of new (and potentially buggy) logic.

I'd appreciate if you could link to my fork from the README.

Thanks!