Update 2.x to 2.19.0 (since 2.18.0 was cut) (#16466)

Signed-off-by: Andriy Redko <[email protected]>

Author: reta

.ci/bwcVersions

@@ -41,3 +41,4 @@ BWC_VERSION:
   - "2.17.1"
   - "2.17.2"
   - "2.18.0"
+  - "2.19.0"

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

@@ -113,6 +113,7 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_2_17_2 = new Version(2170299, org.apache.lucene.util.Version.LUCENE_9_11_1);
     public static final Version V_2_18_0 = new Version(2180099, org.apache.lucene.util.Version.LUCENE_9_12_0);
     public static final Version V_3_0_0 = new Version(3000099, org.apache.lucene.util.Version.LUCENE_9_12_0);
+    public static final Version V_2_19_0 = new Version(2190099, org.apache.lucene.util.Version.LUCENE_9_12_0);
     public static final Version CURRENT = V_3_0_0;
 
     public static Version fromId(int id) {