Elasticsearch: forward headers on bulk insert in SimpleFlowStage

[Charon11]

Problem

enable to authenticate without login/password

Identification

headers not forward on onPush() method in ElasticsearchSimpleFlowStage

alpakka/elasticsearch/src/main/scala/akka/stream/alpakka/elasticsearch/impl/ElasticsearchSimpleFlowStage.scala

Lines 78 to 80 in 3f1b06f

	val request = HttpRequest(HttpMethods.POST)
	.withUri(uri)
	.withEntity(HttpEntity(NDJsonProtocol.`application/x-ndjson`, json))

Resolution

forward header from ElasticsearchConnectionSettings headers to HttpRequest header

[lightbend-cla-validator]

Hi @Charon11,

Thank you for your contribution! We really value the time you've taken to put this together.

Before we proceed with reviewing this pull request, please sign the Lightbend Contributors License Agreement:

https://www.lightbend.com/contribute/cla

[Charon11]

Lightbend Contributors License Agreement : 🆗 but still refuse

[ennru]

Your Lightbend CLA doesn't seem to be cleared, I checked manually. Did you sign it with the correct user Charon11?

[Charon11]

I submit it again

[ennru]

LGTM.

[ennru]

Thank you!