Add 6.3.0 version constant

This commit adds the 6.3 version constant to the 6.x branch and bumps
the 6.x branch to this version.

Author: jasontedor

buildSrc/version.properties

@@ -1,4 +1,4 @@
-elasticsearch     = 6.2.0
+elasticsearch     = 6.3.0
 lucene            = 7.2.1
 
 # optional dependencies

docs/Versions.asciidoc

@@ -1,4 +1,4 @@
-:version:               6.2.0
+:version:               6.3.0
 :major-version:         6.x
 :lucene_version:        7.2.1
 :lucene_version_path:   7_2_0

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

@@ -144,7 +144,9 @@ public class Version implements Comparable<Version> {
     public static final Version V_6_1_3 = new Version(V_6_1_3_ID, org.apache.lucene.util.Version.LUCENE_7_1_0);
     public static final int V_6_2_0_ID = 6020099;
     public static final Version V_6_2_0 = new Version(V_6_2_0_ID, org.apache.lucene.util.Version.LUCENE_7_2_1);
-    public static final Version CURRENT = V_6_2_0;
+    public static final int V_6_3_0_ID = 6030099;
+    public static final Version V_6_3_0 = new Version(V_6_3_0_ID, org.apache.lucene.util.Version.LUCENE_7_2_1);
+    public static final Version CURRENT = V_6_3_0;
 
     static {
         assert CURRENT.luceneVersion.equals(org.apache.lucene.util.Version.LATEST) : "Version must be upgraded to ["
@@ -157,6 +159,8 @@ public static Version readVersion(StreamInput in) throws IOException {
 
     public static Version fromId(int id) {
         switch (id) {
+            case V_6_3_0_ID:
+                return V_6_3_0;
             case V_6_2_0_ID:
                 return V_6_2_0;
             case V_6_1_3_ID:

settings.gradle

@@ -78,7 +78,7 @@ addSubProjects('', new File(rootProject.projectDir, 'plugins'), projects, [])
 addSubProjects('', new File(rootProject.projectDir, 'qa'), projects, [])
 
 /* Create projects for building BWC snapshot distributions from the heads of other branches */
-final List<String> branches = ['5.6', '6.0', '6.1', '6.x']
+final List<String> branches = ['5.6', '6.0', '6.1', '6.2', '6.x']
 for (final String branch : branches) {
   projects.add("distribution:bwc-snapshot-${branch}".toString())
 }