admission controll setting validation

Signed-off-by: Pradeep L <spradeel@amazon.com>

Author: Pradeep L

server/src/main/java/org/opensearch/ratelimitting/admissioncontrol/settings/NativeMemoryBasedAdmissionControllerSettings.java

@@ -24,7 +24,7 @@ public class NativeMemoryBasedAdmissionControllerSettings {
      * Default parameters for the NativeMemoryBasedAdmissionControllerSettings
      */
     public static class Defaults {
-        public static final long NATIVE_MEMORY_USAGE_LIMIT = 80;
+        public static final long NATIVE_MEMORY_USAGE_LIMIT = 95;
         public static final long CLUSTER_ADMIN_NATIVE_MEMORY_USAGE_LIMIT = 95;
     }
 
@@ -52,6 +52,8 @@ public static class Defaults {
     public static final Setting<Long> SEARCH_NATIVE_MEMORY_USAGE_LIMIT = Setting.longSetting(
         "admission_control.search.native_memory_usage.limit",
         Defaults.NATIVE_MEMORY_USAGE_LIMIT,
+        0,
+        100,
         Setting.Property.Dynamic,
         Setting.Property.NodeScope
     );
@@ -63,6 +65,8 @@ public static class Defaults {
     public static final Setting<Long> INDEXING_NATIVE_MEMORY_USAGE_LIMIT = Setting.longSetting(
         "admission_control.indexing.native_memory_usage.limit",
         Defaults.NATIVE_MEMORY_USAGE_LIMIT,
+        0,
+        100,
         Setting.Property.Dynamic,
         Setting.Property.NodeScope
     );
@@ -74,6 +78,8 @@ public static class Defaults {
     public static final Setting<Long> CLUSTER_ADMIN_NATIVE_MEMORY_USAGE_LIMIT = Setting.longSetting(
         "admission_control.cluster_admin.native_memory_usage.limit",
         Defaults.CLUSTER_ADMIN_NATIVE_MEMORY_USAGE_LIMIT,
+        0,
+        100,
         Setting.Property.Dynamic,
         Setting.Property.NodeScope
     );