diff --git a/src/main/java/org/elasticsearch/action/percolate/TransportMultiPercolateAction.java b/src/main/java/org/elasticsearch/action/percolate/TransportMultiPercolateAction.java
index 48a8e768830..5ed98a5024d 100644
--- a/src/main/java/org/elasticsearch/action/percolate/TransportMultiPercolateAction.java
+++ b/src/main/java/org/elasticsearch/action/percolate/TransportMultiPercolateAction.java
@@ -33,7 +33,6 @@ import org.elasticsearch.cluster.routing.ShardIterator;
 import org.elasticsearch.common.inject.Inject;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.util.concurrent.AtomicArray;
-import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
 import org.elasticsearch.index.engine.DocumentMissingException;
 import org.elasticsearch.index.shard.ShardId;
 import org.elasticsearch.percolator.PercolatorService;
@@ -43,9 +42,7 @@ import org.elasticsearch.transport.TransportChannel;
 import org.elasticsearch.transport.TransportService;
 
 import java.util.*;
-import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.atomic.AtomicInteger;
-import java.util.concurrent.atomic.AtomicIntegerArray;
 import java.util.concurrent.atomic.AtomicReferenceArray;
 
 /**
@@ -76,22 +73,20 @@ public class TransportMultiPercolateAction extends TransportAction<MultiPercolat
         final ClusterState clusterState = clusterService.state();
         clusterState.blocks().globalBlockedRaiseException(ClusterBlockLevel.READ);
 
-        final AtomicReferenceArray<Object> percolateRequests = new AtomicReferenceArray<Object>(request.requests().size());
-        TIntArrayList getRequestSlots = new TIntArrayList();
-        List<GetRequest> existingDocsRequests = new ArrayList<GetRequest>();
-        for (int i = 0;  i < request.requests().size(); i++) {
-            PercolateRequest percolateRequest = request.requests().get(i);
-            percolateRequest.startTime = System.currentTimeMillis();
-            percolateRequests.set(i, percolateRequest);
-            if (percolateRequest.getRequest() != null) {
-                existingDocsRequests.add(percolateRequest.getRequest());
-                getRequestSlots.add(i);
-            }
-        }
-
+        final List<Object> percolateRequests = new ArrayList<Object>(request.requests().size());
         // Can have a mixture of percolate requests. (normal percolate requests & percolate existing doc),
         // so we need to keep track for what percolate request we had a get request
-        final AtomicIntegerArray percolateRequestSlotsWithGet = new AtomicIntegerArray(getRequestSlots.toArray());
+        final TIntArrayList getRequestSlots = new TIntArrayList();
+        List<GetRequest> existingDocsRequests = new ArrayList<GetRequest>();
+        for (int slot = 0;  slot < request.requests().size(); slot++) {
+            PercolateRequest percolateRequest = request.requests().get(slot);
+            percolateRequest.startTime = System.currentTimeMillis();
+            percolateRequests.add(percolateRequest);
+            if (percolateRequest.getRequest() != null) {
+                existingDocsRequests.add(percolateRequest.getRequest());
+                getRequestSlots.add(slot);
+            }
+        }
 
         if (!existingDocsRequests.isEmpty()) {
             final MultiGetRequest multiGetRequest = new MultiGetRequest();
@@ -108,16 +103,18 @@ public class TransportMultiPercolateAction extends TransportAction<MultiPercolat
                 public void onResponse(MultiGetResponse multiGetItemResponses) {
                     for (int i = 0; i < multiGetItemResponses.getResponses().length; i++) {
                         MultiGetItemResponse itemResponse = multiGetItemResponses.getResponses()[i];
-                        int slot = percolateRequestSlotsWithGet.get(i);
+                        int slot = getRequestSlots.get(i);
                         if (!itemResponse.isFailed()) {
                             GetResponse getResponse = itemResponse.getResponse();
                             if (getResponse.isExists()) {
                                 PercolateRequest originalRequest = (PercolateRequest) percolateRequests.get(slot);
                                 percolateRequests.set(slot, new PercolateRequest(originalRequest, getResponse.getSourceAsBytesRef()));
                             } else {
+                                logger.trace("mpercolate existing doc, item[{}] doesn't exist", slot);
                                 percolateRequests.set(slot, new DocumentMissingException(null, getResponse.getType(), getResponse.getId()));
                             }
                         } else {
+                            logger.trace("mpercolate existing doc, item[{}] failure {}", slot, itemResponse.getFailure());
                             percolateRequests.set(slot, itemResponse.getFailure());
                         }
                     }
@@ -138,29 +135,29 @@ public class TransportMultiPercolateAction extends TransportAction<MultiPercolat
 
     private class ASyncAction {
 
-        final ActionListener<MultiPercolateResponse> listener;
+        final ActionListener<MultiPercolateResponse> finalListener;
         final Map<ShardId, TransportShardMultiPercolateAction.Request> requestsByShard;
-        final AtomicReferenceArray<Object> percolateRequests;
+        final List<Object> percolateRequests;
 
+        final Map<ShardId, TIntArrayList> shardToSlots;
         final AtomicInteger expectedOperations;
         final AtomicArray<Object> reducedResponses;
-        final ConcurrentMap<ShardId, AtomicIntegerArray> shardToSlots;
         final AtomicReferenceArray<AtomicInteger> expectedOperationsPerItem;
         final AtomicReferenceArray<AtomicReferenceArray> responsesByItemAndShard;
 
-        ASyncAction(AtomicReferenceArray<Object> percolateRequests, ActionListener<MultiPercolateResponse> listener, ClusterState clusterState) {
-            this.listener = listener;
+        ASyncAction(List<Object> percolateRequests, ActionListener<MultiPercolateResponse> finalListener, ClusterState clusterState) {
+            this.finalListener = finalListener;
             this.percolateRequests = percolateRequests;
-            responsesByItemAndShard = new AtomicReferenceArray<AtomicReferenceArray>(percolateRequests.length());
-            expectedOperationsPerItem = new AtomicReferenceArray<AtomicInteger>(percolateRequests.length());
-            reducedResponses = new AtomicArray<Object>(percolateRequests.length());
+            responsesByItemAndShard = new AtomicReferenceArray<AtomicReferenceArray>(percolateRequests.size());
+            expectedOperationsPerItem = new AtomicReferenceArray<AtomicInteger>(percolateRequests.size());
+            reducedResponses = new AtomicArray<Object>(percolateRequests.size());
 
             // Resolving concrete indices and routing and grouping the requests by shard
             requestsByShard = new HashMap<ShardId, TransportShardMultiPercolateAction.Request>();
             // Keep track what slots belong to what shard, in case a request to a shard fails on all copies
-            Map<ShardId, TIntArrayList> shardToSlotsBuilder = new HashMap<ShardId, TIntArrayList>();
+            shardToSlots = new HashMap<ShardId, TIntArrayList>();
             int expectedResults = 0;
-            for (int slot = 0;  slot < percolateRequests.length(); slot++) {
+            for (int slot = 0;  slot < percolateRequests.size(); slot++) {
                 Object element = percolateRequests.get(slot);
                 assert element != null;
                 if (element instanceof PercolateRequest) {
@@ -169,7 +166,7 @@ public class TransportMultiPercolateAction extends TransportAction<MultiPercolat
                     Map<String, Set<String>> routing = clusterState.metaData().resolveSearchRouting(percolateRequest.routing(), percolateRequest.indices());
                     // TODO: I only need shardIds, ShardIterator(ShardRouting) is only needed in TransportShardMultiPercolateAction
                     GroupShardsIterator shards = clusterService.operationRouting().searchShards(
-                            clusterState, percolateRequest.indices(), concreteIndices, routing, percolateRequest.preference()
+                            clusterState, percolateRequest.indices(), concreteIndices, routing, null
                     );
 
                     responsesByItemAndShard.set(slot, new AtomicReferenceArray(shards.size()));
@@ -180,27 +177,24 @@ public class TransportMultiPercolateAction extends TransportAction<MultiPercolat
                         if (requests == null) {
                             requestsByShard.put(shardId, requests = new TransportShardMultiPercolateAction.Request(shard.shardId().getIndex(), shardId.id(), percolateRequest.preference()));
                         }
+                        logger.trace("Adding shard[{}] percolate request for item[{}]", shardId, slot);
                         requests.add(new TransportShardMultiPercolateAction.Request.Item(slot, new PercolateShardRequest(shardId, percolateRequest)));
 
-                        TIntArrayList items = shardToSlotsBuilder.get(shardId);
+                        TIntArrayList items = shardToSlots.get(shardId);
                         if (items == null) {
-                            shardToSlotsBuilder.put(shardId, items = new TIntArrayList());
+                            shardToSlots.put(shardId, items = new TIntArrayList());
                         }
                         items.add(slot);
                     }
                     expectedResults++;
                 } else if (element instanceof Throwable || element instanceof MultiGetResponse.Failure) {
+                    logger.trace("item[{}] won't be executed, reason: {}", slot, element);
                     reducedResponses.set(slot, element);
                     responsesByItemAndShard.set(slot, new AtomicReferenceArray(0));
                     expectedOperationsPerItem.set(slot, new AtomicInteger(0));
                 }
             }
             expectedOperations = new AtomicInteger(expectedResults);
-            // Move slot to shard tracking from normal map to concurrent save map
-            shardToSlots = ConcurrentCollections.newConcurrentMap();
-            for (Map.Entry<ShardId, TIntArrayList> entry : shardToSlotsBuilder.entrySet()) {
-                shardToSlots.put(entry.getKey(), new AtomicIntegerArray(entry.getValue().toArray()));
-            }
         }
 
         void run() {
@@ -209,21 +203,20 @@ public class TransportMultiPercolateAction extends TransportAction<MultiPercolat
                 return;
             }
 
+            logger.trace("mpercolate executing for shards {}", requestsByShard.keySet());
             for (Map.Entry<ShardId, TransportShardMultiPercolateAction.Request> entry : requestsByShard.entrySet()) {
-                final int shardId = entry.getKey().id();
-                final String index =  entry.getKey().index().name();
-
+                final ShardId shardId = entry.getKey();
                 TransportShardMultiPercolateAction.Request shardRequest = entry.getValue();
                 shardMultiPercolateAction.execute(shardRequest, new ActionListener<TransportShardMultiPercolateAction.Response>() {
 
                     @Override
                     public void onResponse(TransportShardMultiPercolateAction.Response response) {
-                        onShardResponse(new ShardId(index, shardId), response);
+                        onShardResponse(shardId, response);
                     }
 
                     @Override
                     public void onFailure(Throwable e) {
-                        onShardFailure(new ShardId(index, shardId), e);
+                        onShardFailure(shardId, e);
                     }
 
                 });
@@ -232,6 +225,7 @@ public class TransportMultiPercolateAction extends TransportAction<MultiPercolat
 
         @SuppressWarnings("unchecked")
         void onShardResponse(ShardId shardId, TransportShardMultiPercolateAction.Response response) {
+            logger.debug("{} Percolate shard response", shardId);
             try {
                 for (TransportShardMultiPercolateAction.Response.Item item : response.items()) {
                     AtomicReferenceArray shardResults = responsesByItemAndShard.get(item.slot());
@@ -255,16 +249,16 @@ public class TransportMultiPercolateAction extends TransportAction<MultiPercolat
                 }
             } catch (Throwable e) {
                 logger.error("{} Percolate original reduce error", e, shardId);
-                listener.onFailure(e);
+                finalListener.onFailure(e);
             }
         }
 
         @SuppressWarnings("unchecked")
         void onShardFailure(ShardId shardId, Throwable e) {
-            logger.debug("Shard multi percolate failure", e);
+            logger.debug("{} Shard multi percolate failure", e, shardId);
             try {
-                AtomicIntegerArray slots = shardToSlots.get(shardId);
-                for (int i = 0; i < slots.length(); i++) {
+                TIntArrayList slots = shardToSlots.get(shardId);
+                for (int i = 0; i < slots.size(); i++) {
                     int slot = slots.get(i);
                     AtomicReferenceArray shardResults = responsesByItemAndShard.get(slot);
                     if (shardResults == null) {
@@ -279,7 +273,7 @@ public class TransportMultiPercolateAction extends TransportAction<MultiPercolat
                 }
             } catch (Throwable t) {
                 logger.error("{} Percolate original reduce error, original error {}", t, shardId, e);
-                listener.onFailure(t);
+                finalListener.onFailure(t);
             }
         }
 
@@ -306,7 +300,7 @@ public class TransportMultiPercolateAction extends TransportAction<MultiPercolat
                     finalResponse[slot] = new MultiPercolateResponse.Item(((MultiGetResponse.Failure)element).getMessage());
                 }
             }
-            listener.onResponse(new MultiPercolateResponse(finalResponse));
+            finalListener.onResponse(new MultiPercolateResponse(finalResponse));
         }
 
     }
diff --git a/src/main/java/org/elasticsearch/action/percolate/TransportShardMultiPercolateAction.java b/src/main/java/org/elasticsearch/action/percolate/TransportShardMultiPercolateAction.java
index f2f2422404c..f586d06b279 100644
--- a/src/main/java/org/elasticsearch/action/percolate/TransportShardMultiPercolateAction.java
+++ b/src/main/java/org/elasticsearch/action/percolate/TransportShardMultiPercolateAction.java
@@ -123,8 +123,6 @@ public class TransportShardMultiPercolateAction extends TransportShardSingleOper
         private String preference;
         private List<Item> items;
 
-        private volatile boolean done = false;
-
         public Request() {
         }
 
diff --git a/src/test/java/org/elasticsearch/test/integration/percolator/RecoveryPercolatorTests.java b/src/test/java/org/elasticsearch/test/integration/percolator/RecoveryPercolatorTests.java
index 0b990650d0d..6479a63a6e9 100644
--- a/src/test/java/org/elasticsearch/test/integration/percolator/RecoveryPercolatorTests.java
+++ b/src/test/java/org/elasticsearch/test/integration/percolator/RecoveryPercolatorTests.java
@@ -35,6 +35,7 @@ import org.elasticsearch.common.unit.TimeValue;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.env.NodeEnvironment;
 import org.elasticsearch.gateway.Gateway;
+import org.elasticsearch.junit.annotations.TestLogging;
 import org.elasticsearch.node.internal.InternalNode;
 import org.elasticsearch.test.integration.AbstractNodesTests;
 import org.junit.After;
@@ -272,6 +273,8 @@ public class RecoveryPercolatorTests extends AbstractNodesTests {
     }
 
     @Test
+    // Need to omit org.elast
+    @TestLogging("action.percolate:TRACE")
     public void testMultiPercolator_recovery() throws Exception {
         percolatorRecovery(true);
     }