enable BWC after lucene 8.8.0 snapshot upgrade (#67323)

build.gradle

@@ -175,9 +175,8 @@ tasks.register("verifyVersions") {
  * after the backport of the backcompat code is complete.
  */
 
-boolean bwc_tests_enabled = false
-String bwc_tests_disabled_issue = "https://github.com/elastic/elasticsearch/pull/67319"
-/* place a PR link here when committing bwc changes */
+boolean bwc_tests_enabled = true
+String bwc_tests_disabled_issue = "" /* place a PR link here when committing bwc changes */
 /*
  * FIPS 140-2 behavior was fixed in 7.11.0. Before that there is no way to run elasticsearch in a
  * JVM that is properly configured to be in fips mode with BCFIPS. For now we need to disable

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

@@ -86,7 +86,7 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_7_10_1 = new Version(7100199, org.apache.lucene.util.Version.LUCENE_8_7_0);
     public static final Version V_7_10_2 = new Version(7100299, org.apache.lucene.util.Version.LUCENE_8_7_0);
     public static final Version V_7_11_0 = new Version(7110099, org.apache.lucene.util.Version.LUCENE_8_7_0);
-    public static final Version V_7_12_0 = new Version(7120099, org.apache.lucene.util.Version.LUCENE_8_7_0);
+    public static final Version V_7_12_0 = new Version(7120099, org.apache.lucene.util.Version.LUCENE_8_8_0);
     public static final Version V_8_0_0 = new Version(8000099, org.apache.lucene.util.Version.LUCENE_8_8_0);
     public static final Version CURRENT = V_8_0_0;