Add version constant for 7.7.0

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

@@ -73,6 +73,7 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_7_5_1 = new Version(7050199, org.apache.lucene.util.Version.LUCENE_8_3_0);
     public static final Version V_7_5_2 = new Version(7050299, org.apache.lucene.util.Version.LUCENE_8_3_0);
     public static final Version V_7_6_0 = new Version(7060099, org.apache.lucene.util.Version.LUCENE_8_4_0);
+    public static final Version V_7_7_0 = new Version(7070099, org.apache.lucene.util.Version.LUCENE_8_4_0);
     public static final Version V_8_0_0 = new Version(8000099, org.apache.lucene.util.Version.LUCENE_8_4_0);
     public static final Version CURRENT = V_8_0_0;