Replaced the word 'shards' with 'replicas' in an error message. (#36234…

…) (#36275)

Closes #36234

server/src/main/java/org/elasticsearch/cluster/metadata/IndexMetaData.java

@@ -1111,7 +1111,7 @@ public IndexMetaData build() {
             }
             int numberOfReplicas = maybeNumberOfReplicas;
             if (numberOfReplicas < 0) {
-                throw new IllegalArgumentException("must specify non-negative number of shards for index [" + index + "]");
+                throw new IllegalArgumentException("must specify non-negative number of replicas for index [" + index + "]");
             }
 
             int routingPartitionSize = INDEX_ROUTING_PARTITION_SIZE_SETTING.get(settings);