Downgrade version check for ser/de of applyLevelAtTransportLayer flag in ClusterHealthRequest (opensearch-project#15803)

Signed-off-by: Swetha Guptha <gupthasg@amazon.com>

Author: SwethaGuptha

server/src/main/java/org/opensearch/action/admin/cluster/health/ClusterHealthRequest.java

@@ -115,7 +115,7 @@ public ClusterHealthRequest(StreamInput in) throws IOException {
         if (in.getVersion().onOrAfter(Version.V_2_6_0)) {
             ensureNodeWeighedIn = in.readBoolean();
         }
-        if (in.getVersion().onOrAfter(Version.V_3_0_0)) {
+        if (in.getVersion().onOrAfter(Version.V_2_17_0)) {
             applyLevelAtTransportLayer = in.readBoolean();
         }
     }
@@ -153,7 +153,7 @@ public void writeTo(StreamOutput out) throws IOException {
         if (out.getVersion().onOrAfter(Version.V_2_6_0)) {
             out.writeBoolean(ensureNodeWeighedIn);
         }
-        if (out.getVersion().onOrAfter(Version.V_3_0_0)) {
+        if (out.getVersion().onOrAfter(Version.V_2_17_0)) {
             out.writeBoolean(applyLevelAtTransportLayer);
         }
     }