Add #8720 to the resiliency page

Closes #9277

docs/resiliency/index.asciidoc

@@ -124,6 +124,11 @@ While we are working on a longer term solution, we introduced a minimum weight o
 
 == Completed
 
+[float]
+=== Make recovery be more resilient to partial network partitions (STATUS: DONE, v1.5.0)
+
+When a node is experience network issues, the master detects it and removes the node from the cluster. That causes all ongoing recoveries from and to that node to be stopped and a new location is found for the relevant shards. However, in the of case partial network partition, where there are connectivity issues between the source and target nodes of a recovery but not between those nodes and the current master things may go wrong. While the nodes successfully restore the connection, the on going recoveries may have encountered issues. In {GIT}8720[#8720], we added test simulations for these and solved several issues that were flagged by them.
+
 [float]
 === Don't allow unsupported codecs (STATUS: DONE, v1.4.0.Beta1)