OpenSearch/elasticsearch
Ryan Ernst 6c7a9af7bf Internal: Remove use of AuditTrail interface in place of
AuditTrailService

We currently have a number of actions and components which try to write
to the audit trail. But they do so by expecting a bound AuditTrail
object. In reality, this should always be AuditTrailService, except when
security is disabled. This change removes the use of the AuditTrail
interface for that purpose, and instead makes the AuditTrailService
allow an empty list of trails, so that it is always bound when running
on a node.

Original commit: elastic/x-pack-elasticsearch@9559dbd6c1
2016-07-19 13:41:19 -07:00
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