Synchronize elasticsearch index creation (#1551)
Synchronize elasticsearch index creation (#1551)

This makes sure we only create an index once per process
and not hundreds of times, like we did with parallel access.

Fixes #1550

Signed-off-by: Ivan Babrou <170b671b4c7ca0a3babfe8ac62ce5a802a745015@gmail.com>
jpkrohling/jaeger,uber/jaeger,jaegertracing/jaeger,pavolloffay/jaeger,uber/jaeger,pavolloffay/jaeger,jpkrohling/jaeger,jaegertracing/jaeger,jaegertracing/jaeger,pavolloffay/jaeger,uber/jaeger,jpkrohling/jaeger,jpkrohling/jaeger,jaegertracing/jaeger,uber/jaeger,jaegertracing/jaeger,jpkrohling/jaeger,pavolloffay/jaeger,pavolloffay/jaeger