Update version for batch shard allocation to 2.14 (opensearch-project#13469)

* Update version for batch shard allocation to 2.14

Signed-off-by: Shivansh Arora <hishiv@amazon.com>

Author: shiv0408

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

@@ -569,7 +569,9 @@ private void allocateExistingUnassignedShards(RoutingAllocation allocation) {
          Use batch mode if enabled and there is no custom allocator set for Allocation service
          */
         Boolean batchModeEnabled = EXISTING_SHARDS_ALLOCATOR_BATCH_MODE.get(settings);
-        if (batchModeEnabled && allocation.nodes().getMinNodeVersion().onOrAfter(Version.V_3_0_0) && existingShardsAllocators.size() == 2) {
+        if (batchModeEnabled
+            && allocation.nodes().getMinNodeVersion().onOrAfter(Version.V_2_14_0)
+            && existingShardsAllocators.size() == 2) {
             /*
              If we do not have any custom allocator set then we will be using ShardsBatchGatewayAllocator
              Currently AllocationService will not run any custom Allocator that implements allocateAllUnassignedShards