Fix starvation and busy waiting of ES StatusUpdaterBolt (Fixes #986)

[FelixEngl]

Hi @jnioche,

like we talked about, I applied the same fixes to the StatusUpdaterBold for ES.
The biggest changes are in afterBulk, where I had to change the order and how the handle things to optimize the locking.

I also fixed the close of ElasticSearchConnection, because you could close the connection multiple times.

Best Regards
Felix

P.s.: I also found some starvation in the IndexBold, I'll also add a PR for that.

Signed-off-by: Felix Engl felix.engl@uni-bamberg.de

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Thanks!

[FelixEngl]

Associated PR: #989

[jnioche]

Thanks @FelixEngl, looks good