Fix

Changed `cluster shard allocation explanation test with double shard
value` to 0 replicas

Author: joshua-adams-1

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/cluster.allocation_explain/10_basic.yml

@@ -79,7 +79,7 @@
   - do:
       indices.create:
         index: test
-        body: { "settings": { "index.number_of_shards": 2, "index.number_of_replicas": 9 } }
+        body: { "settings": { "index.number_of_shards": 2, "index.number_of_replicas": 0 } }
 
   - match: { acknowledged: true }