Add 7.15.0 version constant

Author: mark-vieira

.ci/bwcVersions

@@ -38,4 +38,5 @@ BWC_VERSION:
   - "7.13.2"
   - "7.13.3"
   - "7.14.0"
+  - "7.15.0"
   - "8.0.0"

server/src/main/java/org/elasticsearch/Version.java

@@ -85,6 +85,7 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_7_13_2 = new Version(7130299, org.apache.lucene.util.Version.LUCENE_8_8_2);
     public static final Version V_7_13_3 = new Version(7130399, org.apache.lucene.util.Version.LUCENE_8_8_2);
     public static final Version V_7_14_0 = new Version(7140099, org.apache.lucene.util.Version.LUCENE_8_9_0);
+    public static final Version V_7_15_0 = new Version(7150099, org.apache.lucene.util.Version.LUCENE_8_9_0);
     public static final Version V_8_0_0 = new Version(8000099, org.apache.lucene.util.Version.LUCENE_8_9_0);
     public static final Version CURRENT = V_8_0_0;