Bitbucket Server Stash Data Center support is provided only under a commercial Awesome Graphs license even if you're going to use the set of features that is free in a non-cluster environment.
Indexing repositories in a cluster environment
In Bitbucket Server Stash Data Center, all nodes use one queue for indexing. The more nodes you use, the faster Awesome Graphs finishes indexing your data. When some changes are pushed to the repository, the push request is performed on one node. Awesome Graphs processes this request only on this node, the request is not processed on all other nodes in the cluster.
- another push in the repository, or
- Awesome Graphs is reinstalled, or
- Bitbucket Server Stash is restarted.