Add bwc version 2.18.1 (#16572)

Update Version.java

Signed-off-by: Andriy Redko <[email protected]>
Co-authored-by: opensearch-ci-bot <[email protected]>

Author: opensearch-trigger-bot[bot]

.ci/bwcVersions

@@ -98,4 +98,5 @@ BWC_VERSION:
   - "2.17.0"
   - "2.17.1"
   - "2.17.2"
-  - "2.18.0"
+  - "2.18.0"
+  - "2.18.1"

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

@@ -142,6 +142,7 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_2_17_1 = new Version(2170199, org.apache.lucene.util.Version.LUCENE_9_11_1);
     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_2_18_1 = new Version(2180199, 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_2_19_0;