IGNITE-23919 Remove DurableBackgroundCleanupIndexTreeTask and related code

Author: shishkovilja

modules/core/src/main/java/org/apache/ignite/internal/cache/query/index/sorted/DurableBackgroundCleanupIndexTreeTask.java

@@ -47,13 +47,4 @@ public interface DurableBackgroundTask<R> extends Serializable {
      * @return Future of the tasks.
      */
     IgniteInternalFuture<DurableBackgroundTaskResult<R>> executeAsync(GridKernalContext ctx);
-
-    /**
-     * Converting the current task to another after restoring from metaStorage.
-     *
-     * @return Converted task.
-     */
-    default DurableBackgroundTask<?> convertAfterRestoreIfNeeded() {
-        return this;
-    }
 }

modules/core/src/main/java/org/apache/ignite/internal/processors/cache/persistence/metastorage/pendingtask/DurableBackgroundTask.java

@@ -66,9 +66,6 @@ public enum State {
     /** Current state of the task. */
     private volatile State state = INIT;
 
-    /** Converted from another task. */
-    private final boolean converted;
-
     /**
      * Constructor.
      *
@@ -79,13 +76,11 @@ public enum State {
     public DurableBackgroundTaskState(
         DurableBackgroundTask<R> task,
         GridFutureAdapter<R> outFut,
-        boolean saved,
-        boolean converted
+        boolean saved
     ) {
         this.task = task;
         this.outFut = outFut;
         this.saved = saved;
-        this.converted = converted;
     }
 
     /**
@@ -144,15 +139,6 @@ public boolean state(State exp, State newState) {
         return STATE_UPDATER.compareAndSet(this, exp, newState);
     }
 
-    /**
-     * Check if the task has been converted from another.
-     *
-     * @return {@code True} if it was converted from another task.
-     */
-    public boolean converted() {
-        return converted;
-    }
-
     /** {@inheritDoc} */
     @Override public String toString() {
         return S.toString(DurableBackgroundTaskState.class, this);