Only check replicas in cancelling existing recoveries. (#60564)

Minor performance improvement when only primaries are initializing.

Author: howardhuanghua

server/src/main/java/org/elasticsearch/cluster/routing/RoutingNodes.java

@@ -267,6 +267,10 @@ public boolean hasInactivePrimaries() {
         return inactivePrimaryCount > 0;
     }
 
+    public boolean hasInactiveReplicas() {
+        return inactiveShardCount > inactivePrimaryCount;
+    }
+
     public boolean hasInactiveShards() {
         return inactiveShardCount > 0;
     }

server/src/main/java/org/elasticsearch/gateway/GatewayAllocator.java

@@ -121,7 +121,7 @@ public void beforeAllocation(final RoutingAllocation allocation) {
     @Override
     public void afterPrimariesBeforeReplicas(RoutingAllocation allocation) {
         assert replicaShardAllocator != null;
-        if (allocation.routingNodes().hasInactiveShards()) {
+        if (allocation.routingNodes().hasInactiveReplicas()) {
             // cancel existing recoveries if we have a better match
             replicaShardAllocator.processExistingRecoveries(allocation);
         }