Remove deprecated Engine#newChangesSnapshot (#118426)

The new method with the overloaded chunk size should be used instead.
Relates #114618

Author: jimczi

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

@@ -941,36 +941,19 @@ public boolean allowSearchIdleOptimization() {
      */
     public abstract int countChanges(String source, long fromSeqNo, long toSeqNo) throws IOException;
 
-    /**
-     * @deprecated This method is deprecated will and be removed once #114618 is applied to the serverless repository.
-     * @see #newChangesSnapshot(String, long, long, boolean, boolean, boolean, long)
-     */
-    @Deprecated
-    public abstract Translog.Snapshot newChangesSnapshot(
-        String source,
-        long fromSeqNo,
-        long toSeqNo,
-        boolean requiredFullRange,
-        boolean singleConsumer,
-        boolean accessStats
-    ) throws IOException;
-
     /**
      * Creates a new history snapshot from Lucene for reading operations whose seqno in the requesting seqno range (both inclusive).
      * This feature requires soft-deletes enabled. If soft-deletes are disabled, this method will throw an {@link IllegalStateException}.
      */
-    public Translog.Snapshot newChangesSnapshot(
+    public abstract Translog.Snapshot newChangesSnapshot(
         String source,
         long fromSeqNo,
         long toSeqNo,
         boolean requiredFullRange,
         boolean singleConsumer,
         boolean accessStats,
         long maxChunkSize
-    ) throws IOException {
-        // TODO: Remove this default implementation once the deprecated newChangesSnapshot is removed
-        return newChangesSnapshot(source, fromSeqNo, toSeqNo, requiredFullRange, singleConsumer, accessStats);
-    }
+    ) throws IOException;
 
     /**
      * Checks if this engine has every operations since  {@code startingSeqNo}(inclusive) in its history (either Lucene or translog)

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

@@ -3136,18 +3136,6 @@ public int countChanges(String source, long fromSeqNo, long toSeqNo) throws IOEx
         }
     }
 
-    @Override
-    public Translog.Snapshot newChangesSnapshot(
-        String source,
-        long fromSeqNo,
-        long toSeqNo,
-        boolean requiredFullRange,
-        boolean singleConsumer,
-        boolean accessStats
-    ) throws IOException {
-        return newChangesSnapshot(source, fromSeqNo, toSeqNo, requiredFullRange, singleConsumer, accessStats, -1);
-    }
-
     @Override
     public Translog.Snapshot newChangesSnapshot(
         String source,

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

@@ -361,18 +361,6 @@ public int countChanges(String source, long fromSeqNo, long toSeqNo) throws IOEx
         }
     }
 
-    @Override
-    public Translog.Snapshot newChangesSnapshot(
-        String source,
-        long fromSeqNo,
-        long toSeqNo,
-        boolean requiredFullRange,
-        boolean singleConsumer,
-        boolean accessStats
-    ) throws IOException {
-        return Translog.Snapshot.EMPTY;
-    }
-
     @Override
     public Translog.Snapshot newChangesSnapshot(
         String source,