Move ElasticCommitIndexWorker into run_after_commit block

Closes #2712

app/models/ee/project/import_status_state_machine.rb

@@ -47,7 +47,7 @@ module EE
             end
 
             if current_application_settings.elasticsearch_indexing?
-              ElasticCommitIndexerWorker.perform_async(project.id)
+              project.run_after_commit { ElasticCommitIndexerWorker.perform_async(project.id) }
             end
           end