diff --git a/integ-test/src/yamlRestTest/resources/rest-api-spec/test/issues/4342.yml b/integ-test/src/yamlRestTest/resources/rest-api-spec/test/issues/4342.yml
new file mode 100644
index 00000000000..a3189e7588a
--- /dev/null
+++ b/integ-test/src/yamlRestTest/resources/rest-api-spec/test/issues/4342.yml
@@ -0,0 +1,55 @@
+setup:
+  - do:
+      query.settings:
+        body:
+          transient:
+            plugins.calcite.enabled : true
+
+---
+teardown:
+  - do:
+      query.settings:
+        body:
+          transient:
+            plugins.calcite.enabled : false
+
+---
+"No index found with given index pattern should throw IndexNotFoundException":
+  - skip:
+      features:
+        - headers
+        - allowed_warnings
+  - do:
+      indices.create:
+        index: log-test
+        body:
+          mappings:
+            properties:
+              "@timestamp":
+                type: date
+
+  - do:
+      bulk:
+        index: log-test
+        refresh: true
+        body:
+          - '{"index": {}}'
+          - '{ "@timestamp" : "2025-09-04T16:15:00.000Z" }'
+
+  - do:
+      headers:
+        Content-Type: 'application/json'
+      ppl:
+        body:
+          query: source=log-* | fields @timestamp
+
+  - match: { total: 1 }
+  - length: { datarows: 1 }
+
+  - do:
+      catch: missing # without the patch #4342, it throws 'bad_request' rather 'missing'
+      headers:
+        Content-Type: 'application/json'
+      ppl:
+        body:
+          query: source=log-abc* | fields @timestamp
diff --git a/opensearch/src/main/java/org/opensearch/sql/opensearch/client/OpenSearchNodeClient.java b/opensearch/src/main/java/org/opensearch/sql/opensearch/client/OpenSearchNodeClient.java
index 9f3f114e676..83e913bf425 100644
--- a/opensearch/src/main/java/org/opensearch/sql/opensearch/client/OpenSearchNodeClient.java
+++ b/opensearch/src/main/java/org/opensearch/sql/opensearch/client/OpenSearchNodeClient.java
@@ -89,6 +89,9 @@ public Map<String, IndexMapping> getIndexMappings(String... indexExpression) {
     try {
       GetMappingsResponse mappingsResponse =
           client.admin().indices().prepareGetMappings(indexExpression).setLocal(true).get();
+      if (mappingsResponse.mappings().isEmpty()) {
+        throw new IndexNotFoundException(indexExpression[0]);
+      }
       return mappingsResponse.mappings().entrySet().stream()
           .collect(
               Collectors.toUnmodifiableMap(
diff --git a/opensearch/src/main/java/org/opensearch/sql/opensearch/client/OpenSearchRestClient.java b/opensearch/src/main/java/org/opensearch/sql/opensearch/client/OpenSearchRestClient.java
index a65aa1997a8..2225a35ad54 100644
--- a/opensearch/src/main/java/org/opensearch/sql/opensearch/client/OpenSearchRestClient.java
+++ b/opensearch/src/main/java/org/opensearch/sql/opensearch/client/OpenSearchRestClient.java
@@ -29,6 +29,7 @@
 import org.opensearch.client.indices.GetMappingsResponse;
 import org.opensearch.cluster.metadata.AliasMetadata;
 import org.opensearch.common.settings.Settings;
+import org.opensearch.index.IndexNotFoundException;
 import org.opensearch.sql.opensearch.mapping.IndexMapping;
 import org.opensearch.sql.opensearch.request.OpenSearchRequest;
 import org.opensearch.sql.opensearch.request.OpenSearchScrollRequest;
@@ -71,6 +72,9 @@ public Map<String, IndexMapping> getIndexMappings(String... indexExpression) {
     GetMappingsRequest request = new GetMappingsRequest().indices(indexExpression);
     try {
       GetMappingsResponse response = client.indices().getMapping(request, RequestOptions.DEFAULT);
+      if (response.mappings().isEmpty()) {
+        throw new IndexNotFoundException(indexExpression[0]);
+      }
       return response.mappings().entrySet().stream()
           .collect(Collectors.toMap(Map.Entry::getKey, e -> new IndexMapping(e.getValue())));
     } catch (IOException e) {
diff --git a/opensearch/src/test/java/org/opensearch/sql/opensearch/client/OpenSearchNodeClientTest.java b/opensearch/src/test/java/org/opensearch/sql/opensearch/client/OpenSearchNodeClientTest.java
index 6e8cb789b42..948ac4854c0 100644
--- a/opensearch/src/test/java/org/opensearch/sql/opensearch/client/OpenSearchNodeClientTest.java
+++ b/opensearch/src/test/java/org/opensearch/sql/opensearch/client/OpenSearchNodeClientTest.java
@@ -241,6 +241,12 @@ void get_index_mappings_with_IOException() {
     assertThrows(IllegalStateException.class, () -> client.getIndexMappings(indexName));
   }
 
+  @Test
+  void get_index_mappings_with_index_patterns() {
+    mockNodeClientIndicesMappings("", null);
+    assertThrows(IndexNotFoundException.class, () -> client.getIndexMappings("test*"));
+  }
+
   @Test
   void get_index_mappings_with_non_exist_index() {
     when(nodeClient.admin().indices().prepareGetMappings(any()).setLocal(anyBoolean()).get())
@@ -494,7 +500,9 @@ public void mockNodeClientIndicesMappings(String indexName, String mappings) {
         .thenReturn(mockResponse);
     try {
       Map<String, MappingMetadata> metadata;
-      if (mappings.isEmpty()) {
+      if (mappings == null) {
+        metadata = Map.of();
+      } else if (mappings.isEmpty()) {
         when(emptyMapping.getSourceAsMap()).thenReturn(Map.of());
         metadata = Map.of(indexName, emptyMapping);
       } else {
diff --git a/opensearch/src/test/java/org/opensearch/sql/opensearch/client/OpenSearchRestClientTest.java b/opensearch/src/test/java/org/opensearch/sql/opensearch/client/OpenSearchRestClientTest.java
index 4991fbbbdfd..6be02c9d6f1 100644
--- a/opensearch/src/test/java/org/opensearch/sql/opensearch/client/OpenSearchRestClientTest.java
+++ b/opensearch/src/test/java/org/opensearch/sql/opensearch/client/OpenSearchRestClientTest.java
@@ -62,6 +62,7 @@
 import org.opensearch.core.xcontent.DeprecationHandler;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.core.xcontent.XContentParser;
+import org.opensearch.index.IndexNotFoundException;
 import org.opensearch.search.SearchHit;
 import org.opensearch.search.SearchHits;
 import org.opensearch.search.builder.SearchSourceBuilder;
@@ -225,6 +226,15 @@ void get_index_mappings() throws IOException {
                 OpenSearchTextType.of(MappingType.Long), parsedTypes.get("manager.salary")));
   }
 
+  @Test
+  void get_index_mappings_with_index_patterns() throws IOException {
+    GetMappingsResponse response = mock(GetMappingsResponse.class);
+    when(response.mappings()).thenReturn(Map.of());
+    when(restClient.indices().getMapping(any(GetMappingsRequest.class), any()))
+        .thenReturn(response);
+    assertThrows(IndexNotFoundException.class, () -> client.getIndexMappings("test*"));
+  }
+
   @Test
   void get_index_mappings_with_IOException() throws IOException {
     when(restClient.indices().getMapping(any(GetMappingsRequest.class), any()))