InternalEngine - don't assert on MAX_UNSAFE_AUTO_ID_TIMESTAMP_COMMIT_ID if index was created before 5.5.0

It was adding in #24149 which was merged into 5.5.0

Author: bleskes

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

@@ -1954,7 +1954,8 @@ private void commitIndexWriter(IndexWriter writer, Iterable<Map.Entry<String, St
             // assert we don't loose key entries
             assert commitDataAsMap(writer).containsKey(Translog.TRANSLOG_UUID_KEY) : "commit misses translog uuid";
             assert commitDataAsMap(writer).containsKey(Translog.TRANSLOG_GENERATION_KEY) : "commit misses translog generation";
-            assert commitDataAsMap(writer).containsKey(MAX_UNSAFE_AUTO_ID_TIMESTAMP_COMMIT_ID) : "commit misses max unsafe timestamp";
+            assert commitDataAsMap(writer).containsKey(MAX_UNSAFE_AUTO_ID_TIMESTAMP_COMMIT_ID) ||
+                config().getIndexSettings().getIndexVersionCreated().before(Version.V_5_5_0): "commit misses max unsafe timestamp";
             assert commitDataAsMap(writer).containsKey(HISTORY_UUID_KEY) : "commit misses a history uuid";
             assert commitDataAsMap(writer).containsKey(SequenceNumbers.LOCAL_CHECKPOINT_KEY) ||
                 config().getIndexSettings().getIndexVersionCreated().before(Version.V_6_0_0_alpha1): "commit misses local checkpoint";