Merge pull request elastic#94 from EmandM/master

Update Coordination.md claiming issue 21312

Author: kblincoe

Coordination.md

@@ -29,6 +29,7 @@ Issue number: group name (no links to elasticsearch, just the number - sort by i
 * 18543: Oink
 * 19391: FDJ
 * 20912: Evil_Engineers
+* 21312: Rocky Road
 * 21418: marathon
 * 21772: Random 1
 * 21802: JQ