[ML][Inference] don't return inflated definition when storing trained models

docs/java-rest/high-level/ml/put-trained-model.asciidoc

@@ -46,6 +46,8 @@ include::../execution.asciidoc[]
 ==== Response
 
 The returned +{response}+ contains the newly created trained model.
+The +{response}+ will omit the model definition as a precaution against
+streaming large model definitions back to the client.
 
 ["source","java",subs="attributes,callouts,macros"]
 --------------------------------------------------

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/inference/TrainedModelConfig.java

@@ -280,7 +280,7 @@ public XContentBuilder toXContent(XContentBuilder builder, Params params) throws
         builder.timeField(CREATE_TIME.getPreferredName(), CREATE_TIME.getPreferredName() + "_string", createTime.toEpochMilli());
         // We don't store the definition in the same document as the configuration
         if ((params.paramAsBoolean(ToXContentParams.FOR_INTERNAL_STORAGE, false) == false) && definition != null) {
-            if (params.paramAsBoolean(DECOMPRESS_DEFINITION, true)) {
+            if (params.paramAsBoolean(DECOMPRESS_DEFINITION, false)) {
                 builder.field(DEFINITION.getPreferredName(), definition);
             } else {
                 builder.field(COMPRESSED_DEFINITION.getPreferredName(), definition.getCompressedString());
@@ -371,6 +371,9 @@ public Builder(TrainedModelConfig config) {
             this.tags = config.getTags();
             this.metadata = config.getMetadata();
             this.input = config.getInput();
+            this.estimatedOperations = config.estimatedOperations;
+            this.estimatedHeapMemory = config.estimatedHeapMemory;
+            this.licenseLevel = config.licenseLevel.description();
         }
 
         public Builder setModelId(String modelId) {

x-pack/plugin/ml/qa/native-multi-node-tests/src/test/java/org/elasticsearch/xpack/ml/integration/TrainedModelIT.java

@@ -93,6 +93,7 @@ public void testGetTrainedModels() throws IOException {
         assertThat(response, containsString("\"estimated_heap_memory_usage_bytes\""));
         assertThat(response, containsString("\"estimated_heap_memory_usage\""));
         assertThat(response, containsString("\"definition\""));
+        assertThat(response, not(containsString("\"compressed_definition\"")));
         assertThat(response, containsString("\"count\":1"));
 
         getModel = client().performRequest(new Request("GET",

x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/action/TransportPutTrainedModelAction.java

@@ -108,7 +108,10 @@ protected void masterOperation(Task task,
 
         ActionListener<Void> tagsModelIdCheckListener = ActionListener.wrap(
             r -> trainedModelProvider.storeTrainedModel(trainedModelConfig, ActionListener.wrap(
-                storedConfig -> listener.onResponse(new PutTrainedModelAction.Response(trainedModelConfig)),
+                bool -> {
+                    TrainedModelConfig configToReturn = new TrainedModelConfig.Builder(trainedModelConfig).clearDefinition().build();
+                    listener.onResponse(new PutTrainedModelAction.Response(configToReturn));
+                },
                 listener::onFailure
             )),
             listener::onFailure

x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/rest/inference/RestGetTrainedModelsAction.java

@@ -8,8 +8,14 @@
 import org.elasticsearch.client.node.NodeClient;
 import org.elasticsearch.cluster.metadata.MetaData;
 import org.elasticsearch.common.Strings;
+import org.elasticsearch.common.xcontent.ToXContent;
+import org.elasticsearch.common.xcontent.ToXContentObject;
+import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.rest.BaseRestHandler;
+import org.elasticsearch.rest.BytesRestResponse;
+import org.elasticsearch.rest.RestChannel;
 import org.elasticsearch.rest.RestRequest;
+import org.elasticsearch.rest.RestResponse;
 import org.elasticsearch.rest.action.RestToXContentListener;
 import org.elasticsearch.xpack.core.action.util.PageParams;
 import org.elasticsearch.xpack.core.ml.action.GetTrainedModelsAction;
@@ -18,7 +24,9 @@
 
 import java.io.IOException;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import java.util.Set;
 
 import static java.util.Arrays.asList;
@@ -34,6 +42,8 @@ public List<Route> routes() {
             new Route(GET, MachineLearning.BASE_PATH + "inference"));
     }
 
+    private static final Map<String, String> DEFAULT_TO_XCONTENT_VALUES =
+        Collections.singletonMap(TrainedModelConfig.DECOMPRESS_DEFINITION, Boolean.toString(true));
     @Override
     public String getName() {
         return "ml_get_trained_models_action";
@@ -56,12 +66,33 @@ protected RestChannelConsumer prepareRequest(RestRequest restRequest, NodeClient
                 restRequest.paramAsInt(PageParams.SIZE.getPreferredName(), PageParams.DEFAULT_SIZE)));
         }
         request.setAllowNoResources(restRequest.paramAsBoolean(ALLOW_NO_MATCH.getPreferredName(), request.isAllowNoResources()));
-        return channel -> client.execute(GetTrainedModelsAction.INSTANCE, request, new RestToXContentListener<>(channel));
+        return channel -> client.execute(GetTrainedModelsAction.INSTANCE,
+            request,
+            new RestToXContentListenerWithDefaultValues<>(channel, DEFAULT_TO_XCONTENT_VALUES));
     }
 
     @Override
     protected Set<String> responseParams() {
         return Collections.singleton(TrainedModelConfig.DECOMPRESS_DEFINITION);
     }
 
+    private static class RestToXContentListenerWithDefaultValues<T extends ToXContentObject> extends RestToXContentListener<T> {
+        private final Map<String, String> defaultToXContentParamValues;
+
+        private RestToXContentListenerWithDefaultValues(RestChannel channel, Map<String, String> defaultToXContentParamValues) {
+            super(channel);
+            this.defaultToXContentParamValues = defaultToXContentParamValues;
+        }
+
+        @Override
+        public RestResponse buildResponse(T response, XContentBuilder builder) throws Exception {
+            assert response.isFragment() == false; //would be nice if we could make default methods final
+            Map<String, String> params = new HashMap<>(channel.request().params());
+            defaultToXContentParamValues.forEach((k, v) ->
+                params.computeIfAbsent(k, defaultToXContentParamValues::get)
+            );
+            response.toXContent(builder, new ToXContent.MapParams(params));
+            return new BytesRestResponse(getStatus(response), builder);
+        }
+    }
 }

x-pack/plugin/src/test/resources/rest-api-spec/test/ml/inference_crud.yml

@@ -460,3 +460,53 @@ setup:
               }
             }
           }
+---
+"Test put model":
+  - do:
+      ml.put_trained_model:
+        model_id: my-regression-model
+        body: >
+          {
+            "description": "model for tests",
+            "input": {"field_names": ["field1", "field2"]},
+            "definition": {
+               "preprocessors": [],
+               "trained_model": {
+                  "ensemble": {
+                    "target_type": "regression",
+                    "trained_models": [
+                      {
+                        "tree": {
+                          "feature_names": ["field1", "field2"],
+                          "tree_structure": [
+                             {"node_index": 0, "threshold": 2, "left_child": 1, "right_child": 2},
+                             {"node_index": 1, "leaf_value": 0},
+                             {"node_index": 2, "leaf_value": 1}
+                          ],
+                          "target_type": "regression"
+                        }
+                      },
+                      {
+                        "tree": {
+                          "feature_names": ["field1", "field2"],
+                          "tree_structure": [
+                             {"node_index": 0, "threshold": 2, "left_child": 1, "right_child": 2},
+                             {"node_index": 1, "leaf_value": 0},
+                             {"node_index": 2, "leaf_value": 1}
+                          ],
+                          "target_type": "regression"
+                        }
+                      }
+                    ]
+                  }
+               }
+            }
+          }
+  - match: { model_id: my-regression-model }
+  - match: { estimated_operations: 6 }
+  - is_false: definition
+  - is_false: compressed_definition
+  - is_true: license_level
+  - is_true: create_time
+  - is_true: version
+  - is_true: estimated_heap_memory_usage_bytes