Missing parent routing causes NullPointerException in Bulk API #8506
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Now each error is reported in bulk response rather than causing entire bulk to fail.
Added a Junit test but the use of TransportClient means the error is manifested differently to a REST based request - instead of a NullPointer the whole of the bulk request failed with a RoutingMissingException. Changed TransportBulkAction to catch this exception and treat it the same as the existing logic for a ElasticsearchParseException - the individual bulk request items are flagged and reported individually rather than failing the whole bulk request.
Closes #8365