Bump version to 8.4.0

.backportrc.json

@@ -2,6 +2,7 @@
   "upstream": "elastic/elasticsearch",
   "targetBranchChoices": [
     "master",
+    "8.3",
     "8.2",
     "8.1",
     "8.0",
@@ -10,7 +11,7 @@
   ],
   "targetPRLabels": ["backport"],
   "branchLabelMapping": {
-    "^v8.3.0$": "master",
+    "^v8.4.0$": "master",
     "^v(\\d+).(\\d+).\\d+(?:-(?:alpha|beta|rc)\\d+)?$": "$1.$2"
   }
 }

.ci/bwcVersions

@@ -64,3 +64,4 @@ BWC_VERSION:
   - "8.2.1"
   - "8.2.2"
   - "8.3.0"
+  - "8.4.0"

.ci/snapshotBwcVersions

@@ -2,3 +2,4 @@ BWC_VERSION:
   - "7.17.5"
   - "8.2.2"
   - "8.3.0"
+  - "8.4.0"

build-tools-internal/version.properties

@@ -1,4 +1,4 @@
-elasticsearch     = 8.3.0
+elasticsearch     = 8.4.0
 lucene            = 9.2.0-snapshot-ba8c3a806ad
 
 bundled_jdk_vendor = openjdk

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

@@ -112,7 +112,8 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_8_2_1 = new Version(8_02_01_99, org.apache.lucene.util.Version.LUCENE_9_1_0);
     public static final Version V_8_2_2 = new Version(8_02_02_99, org.apache.lucene.util.Version.LUCENE_9_1_0);
     public static final Version V_8_3_0 = new Version(8_03_00_99, org.apache.lucene.util.Version.LUCENE_9_2_0);
-    public static final Version CURRENT = V_8_3_0;
+    public static final Version V_8_4_0 = new Version(8_04_00_99, org.apache.lucene.util.Version.LUCENE_9_2_0);
+    public static final Version CURRENT = V_8_4_0;
 
     private static final Map<Integer, Version> idToVersion;
     private static final Map<String, Version> stringToVersion;