Add exception for perform embedding inference requests with query provided

docs/changelog/131641.yaml

@@ -0,0 +1,5 @@
+pr: 131641
+summary: Add exception for perform embedding inference requests with query provided
+area: Machine Learning
+type: bug
+issues: []

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/inference/action/InferenceAction.java

@@ -273,6 +273,14 @@ public ActionRequestValidationException validate() {
                 }
             }
 
+            if (taskType.equals(TaskType.TEXT_EMBEDDING) || taskType.equals(TaskType.SPARSE_EMBEDDING)) {
+                if (query != null) {
+                    var e = new ActionRequestValidationException();
+                    e.addValidationError(format("Field [query] cannot be specified for task type [%s]", taskType));
+                    return e;
+                }
+            }
+
             if (taskType.equals(TaskType.TEXT_EMBEDDING) == false
                 && taskType.equals(TaskType.ANY) == false
                 && (inputType != null && InputType.isInternalTypeOrUnspecified(inputType) == false)) {

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/inference/action/InferenceActionRequestTests.java

@@ -191,6 +191,24 @@ public void testValidation_TextEmbedding_WithTopN() {
         assertThat(inputError.getMessage(), is("Validation Failed: 1: Field [top_n] cannot be specified for task type [text_embedding];"));
     }
 
+    public void testValidation_TextEmbedding_WithQuery() {
+        InferenceAction.Request queryRequest = new InferenceAction.Request(
+            TaskType.TEXT_EMBEDDING,
+            "model",
+            "query",
+            null,
+            null,
+            List.of("input"),
+            null,
+            null,
+            null,
+            false
+        );
+        ActionRequestValidationException queryError = queryRequest.validate();
+        assertNotNull(queryError);
+        assertThat(queryError.getMessage(), is("Validation Failed: 1: Field [query] cannot be specified for task type [text_embedding];"));
+    }
+
     public void testValidation_Rerank_Null() {
         InferenceAction.Request queryNullRequest = new InferenceAction.Request(
             TaskType.RERANK,
@@ -249,7 +267,7 @@ public void testValidation_SparseEmbedding_WithInputType() {
         InferenceAction.Request queryRequest = new InferenceAction.Request(
             TaskType.SPARSE_EMBEDDING,
             "model",
-            "",
+            null,
             null,
             null,
             List.of("input"),
@@ -309,6 +327,27 @@ public void testValidation_SparseEmbedding_WithTopN() {
         );
     }
 
+    public void testValidation_SparseEmbedding_WithQuery() {
+        InferenceAction.Request queryRequest = new InferenceAction.Request(
+            TaskType.SPARSE_EMBEDDING,
+            "model",
+            "query",
+            null,
+            null,
+            List.of("input"),
+            null,
+            null,
+            null,
+            false
+        );
+        ActionRequestValidationException queryError = queryRequest.validate();
+        assertNotNull(queryError);
+        assertThat(
+            queryError.getMessage(),
+            is("Validation Failed: 1: Field [query] cannot be specified for task type [sparse_embedding];")
+        );
+    }
+
     public void testValidation_Completion_WithInputType() {
         InferenceAction.Request queryRequest = new InferenceAction.Request(
             TaskType.COMPLETION,