Bump 2.x to 2.16.0 (opensearch-project#14216)

Signed-off-by: Peter Zhu <[email protected]>

Author: peterzhuamazon

.ci/bwcVersions

@@ -34,3 +34,4 @@ BWC_VERSION:
   - "2.14.0"
   - "2.14.1"
   - "2.15.0"
+  - "2.16.0"

libs/core/src/main/java/org/opensearch/Version.java

@@ -105,6 +105,7 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_2_14_0 = new Version(2140099, org.apache.lucene.util.Version.LUCENE_9_10_0);
     public static final Version V_2_14_1 = new Version(2140199, org.apache.lucene.util.Version.LUCENE_9_10_0);
     public static final Version V_2_15_0 = new Version(2150099, org.apache.lucene.util.Version.LUCENE_9_10_0);
+    public static final Version V_2_16_0 = new Version(2160099, org.apache.lucene.util.Version.LUCENE_9_10_0);
     public static final Version V_3_0_0 = new Version(3000099, org.apache.lucene.util.Version.LUCENE_9_11_0);
     public static final Version CURRENT = V_3_0_0;