diff --git a/server/src/main/java/org/opensearch/action/search/GetAllPitNodesResponse.java b/server/src/main/java/org/opensearch/action/search/GetAllPitNodesResponse.java
index 055eb84ab3811..9bb3ab6407696 100644
--- a/server/src/main/java/org/opensearch/action/search/GetAllPitNodesResponse.java
+++ b/server/src/main/java/org/opensearch/action/search/GetAllPitNodesResponse.java
@@ -41,6 +41,12 @@ public class GetAllPitNodesResponse extends BaseNodesResponse<GetAllPitNodeRespo
 
     public GetAllPitNodesResponse(StreamInput in) throws IOException {
         super(in);
+        Set<String> uniquePitIds = new HashSet<>();
+        pitInfos.addAll(
+            getNodes().stream()
+                .flatMap(p -> p.getPitInfos().stream().filter(t -> uniquePitIds.add(t.getPitId())))
+                .collect(Collectors.toList())
+        );
     }
 
     public GetAllPitNodesResponse(
diff --git a/server/src/main/java/org/opensearch/action/search/ListPitInfo.java b/server/src/main/java/org/opensearch/action/search/ListPitInfo.java
index e120507f4d47a..220b7247517b9 100644
--- a/server/src/main/java/org/opensearch/action/search/ListPitInfo.java
+++ b/server/src/main/java/org/opensearch/action/search/ListPitInfo.java
@@ -17,6 +17,7 @@
 import org.opensearch.core.xcontent.XContentBuilder;
 
 import java.io.IOException;
+import java.util.Objects;
 
 import static org.opensearch.core.xcontent.ConstructingObjectParser.constructorArg;
 
@@ -80,4 +81,17 @@ public XContentBuilder toXContent(XContentBuilder builder, Params params) throws
         return builder;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        ListPitInfo that = (ListPitInfo) o;
+        return pitId.equals(that.pitId) && creationTime == that.creationTime && keepAlive == that.keepAlive;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(pitId, creationTime, keepAlive);
+    }
+
 }
diff --git a/server/src/test/java/org/opensearch/action/search/GetAllPitNodesResponseTests.java b/server/src/test/java/org/opensearch/action/search/GetAllPitNodesResponseTests.java
new file mode 100644
index 0000000000000..882b397575e93
--- /dev/null
+++ b/server/src/test/java/org/opensearch/action/search/GetAllPitNodesResponseTests.java
@@ -0,0 +1,98 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.action.search;
+
+import org.opensearch.Version;
+import org.opensearch.action.FailedNodeException;
+import org.opensearch.cluster.ClusterName;
+import org.opensearch.cluster.node.DiscoveryNode;
+import org.opensearch.core.common.io.stream.NamedWriteableRegistry;
+import org.opensearch.test.OpenSearchTestCase;
+import org.opensearch.transport.TransportException;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import static java.util.Collections.emptyMap;
+import static java.util.Collections.emptySet;
+
+public class GetAllPitNodesResponseTests extends OpenSearchTestCase {
+    protected void assertEqualInstances(GetAllPitNodesResponse expected, GetAllPitNodesResponse actual) {
+        assertNotSame(expected, actual);
+        Set<ListPitInfo> expectedPitInfos = new HashSet<>(expected.getPitInfos());
+        Set<ListPitInfo> actualPitInfos = new HashSet<>(actual.getPitInfos());
+        assertEquals(expectedPitInfos, actualPitInfos);
+
+        List<GetAllPitNodeResponse> expectedResponses = expected.getNodes();
+        List<GetAllPitNodeResponse> actualResponses = actual.getNodes();
+        assertEquals(expectedResponses.size(), actualResponses.size());
+        for (int i = 0; i < expectedResponses.size(); i++) {
+            assertEquals(expectedResponses.get(i).getNode(), actualResponses.get(i).getNode());
+            Set<ListPitInfo> expectedNodePitInfos = new HashSet<>(expectedResponses.get(i).getPitInfos());
+            Set<ListPitInfo> actualNodePitInfos = new HashSet<>(actualResponses.get(i).getPitInfos());
+            assertEquals(expectedNodePitInfos, actualNodePitInfos);
+        }
+
+        List<FailedNodeException> expectedFailures = expected.failures();
+        List<FailedNodeException> actualFailures = actual.failures();
+        assertEquals(expectedFailures.size(), actualFailures.size());
+        for (int i = 0; i < expectedFailures.size(); i++) {
+            assertEquals(expectedFailures.get(i).nodeId(), actualFailures.get(i).nodeId());
+            assertEquals(expectedFailures.get(i).getMessage(), actualFailures.get(i).getMessage());
+            assertEquals(expectedFailures.get(i).getCause().getClass(), actualFailures.get(i).getCause().getClass());
+        }
+    }
+
+    protected NamedWriteableRegistry getNamedWriteableRegistry() {
+        return new NamedWriteableRegistry(Collections.emptyList());
+    }
+
+    public void testSerialization() throws IOException {
+        GetAllPitNodesResponse response = createTestItem();
+        GetAllPitNodesResponse deserialized = copyWriteable(response, getNamedWriteableRegistry(), GetAllPitNodesResponse::new);
+        assertEqualInstances(response, deserialized);
+    }
+
+    private GetAllPitNodesResponse createTestItem() {
+        int numNodes = randomIntBetween(1, 10);
+        int numPits = randomInt(10);
+        List<ListPitInfo> candidatePitInfos = new ArrayList<>(numPits);
+        for (int i = 0; i < numNodes; i++) {
+            candidatePitInfos.add(new ListPitInfo(randomAlphaOfLength(10), randomLong(), randomLong()));
+        }
+
+        List<GetAllPitNodeResponse> responses = new ArrayList<>();
+        List<FailedNodeException> failures = new ArrayList<>();
+        for (int i = 0; i < numNodes; i++) {
+            DiscoveryNode node = new DiscoveryNode(
+                randomAlphaOfLength(10),
+                buildNewFakeTransportAddress(),
+                emptyMap(),
+                emptySet(),
+                Version.CURRENT
+            );
+            if (randomBoolean()) {
+                List<ListPitInfo> nodePitInfos = new ArrayList<>();
+                for (int j = 0; j < randomInt(numPits); j++) {
+                    nodePitInfos.add(randomFrom(candidatePitInfos));
+                }
+                responses.add(new GetAllPitNodeResponse(node, nodePitInfos));
+            } else {
+                failures.add(
+                    new FailedNodeException(node.getId(), randomAlphaOfLength(10), new TransportException(randomAlphaOfLength(10)))
+                );
+            }
+        }
+        return new GetAllPitNodesResponse(new ClusterName("test"), responses, failures);
+    }
+}