[analytics-engine] Collapse AggregateDecompositionResolver into BackendPlanAdapter's adaptNode chain (opensearch-project#21645)

Signed-off-by: Sandesh Kumar <sandeshkr419@gmail.com>

Author: sandeshkr419

sandbox/plugins/analytics-engine/src/main/java/org/opensearch/analytics/exec/DefaultPlanExecutor.java

@@ -24,7 +24,6 @@
 import org.opensearch.analytics.planner.CapabilityRegistry;
 import org.opensearch.analytics.planner.PlannerContext;
 import org.opensearch.analytics.planner.PlannerImpl;
-import org.opensearch.analytics.planner.dag.AggregateDecompositionResolver;
 import org.opensearch.analytics.planner.dag.BackendPlanAdapter;
 import org.opensearch.analytics.planner.dag.DAGBuilder;
 import org.opensearch.analytics.planner.dag.FragmentConversionDriver;
@@ -133,7 +132,6 @@ private void executeInternal(RelNode logicalFragment, ActionListener<Iterable<Ob
         QueryDAG dag = DAGBuilder.build(plan, capabilityRegistry, clusterService);
         PlanForker.forkAll(dag, capabilityRegistry);
         BackendPlanAdapter.adaptAll(dag, capabilityRegistry);
-        AggregateDecompositionResolver.resolveAll(dag, capabilityRegistry);
         FragmentConversionDriver.convertAll(dag, capabilityRegistry);
         logger.debug("[DefaultPlanExecutor] QueryDAG:\n{}", dag);