Get last primary term on every commit before calling IndexCommitListener (#94670)

Get the last primary term value before calling the IndexCommitListener.

Relates ES-5258

Author: tlrx

server/src/main/java/org/elasticsearch/index/engine/InternalEngine.java

@@ -347,11 +347,11 @@ private SoftDeletesPolicy newSoftDeletesPolicy() throws IOException {
     private CombinedDeletionPolicy.CommitsListener newCommitsListener() {
         final Engine.IndexCommitListener listener = engineConfig.getIndexCommitListener();
         if (listener != null) {
-            var primaryTerm = config().getPrimaryTermSupplier().getAsLong();
             return new CombinedDeletionPolicy.CommitsListener() {
                 @Override
                 public void onNewAcquiredCommit(final IndexCommit commit, final Set<String> additionalFiles) {
                     final IndexCommitRef indexCommitRef = acquireIndexCommitRef(() -> commit);
+                    var primaryTerm = config().getPrimaryTermSupplier().getAsLong();
                     assert indexCommitRef.getIndexCommit() == commit;
                     listener.onNewCommit(shardId, store, primaryTerm, indexCommitRef, additionalFiles);
                 }