updates, moar verbose

plugins/ingest/src/main/java/org/elasticsearch/ingest/Data.java

@@ -44,6 +44,10 @@ public final class Data {
         this.document = document;
     }
 
+    public Data(Data other) {
+        this(other.index, other.type, other.id, new HashMap<>(other.document));
+    }
+
     @SuppressWarnings("unchecked")
     public <T> T getProperty(String path) {
         // TODO: we should not rely on any core class, so we should have custom map extract value logic:

plugins/ingest/src/main/java/org/elasticsearch/ingest/Pipeline.java

@@ -70,6 +70,21 @@ public final class Pipeline {
         return processors;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Pipeline pipeline = (Pipeline) o;
+        return Objects.equals(id, pipeline.id) &&
+                Objects.equals(description, pipeline.description) &&
+                Objects.equals(processors, pipeline.processors);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, description, processors);
+    }
+
     public final static class Factory {
 
         public Pipeline create(String id, Map<String, Object> config, Map<String, Processor.Factory> processorRegistry) throws IOException {

plugins/ingest/src/main/java/org/elasticsearch/ingest/processor/ConfigurationUtils.java

@@ -77,39 +77,41 @@ public final class ConfigurationUtils {
      * Returns and removes the specified property of type list from the specified configuration map.
      *
      * If the property value isn't of type list an {@link IllegalArgumentException} is thrown.
-     * If the property is missing an {@link IllegalArgumentException} is thrown
      */
-    public static List<String> readStringList(Map<String, Object> configuration, String propertyName) {
+    public static <T> List<T> readOptionalList(Map<String, Object> configuration, String propertyName) {
         Object value = configuration.remove(propertyName);
         if (value == null) {
-            throw new IllegalArgumentException("required property [" + propertyName + "] is missing");
+            return null;
         }
-        return readStringList(propertyName, value);
+        return readList(propertyName, value);
     }
 
     /**
      * Returns and removes the specified property of type list from the specified configuration map.
      *
      * If the property value isn't of type list an {@link IllegalArgumentException} is thrown.
+     * If the property is missing an {@link IllegalArgumentException} is thrown
      */
-    public static List<String> readOptionalStringList(Map<String, Object> configuration, String propertyName) {
+    public static <T> List<T> readList(Map<String, Object> configuration, String propertyName) {
         Object value = configuration.remove(propertyName);
         if (value == null) {
-            return null;
+            throw new IllegalArgumentException("required property [" + propertyName + "] is missing");
         }
-        return readStringList(propertyName, value);
+
+        return readList(propertyName, value);
     }
 
-    private static List<String> readStringList(String propertyName, Object value) {
+    private static <T> List<T> readList(String propertyName, Object value) {
         if (value instanceof List) {
             @SuppressWarnings("unchecked")
-            List<String> stringList = (List<String>) value;
+            List<T> stringList = (List<T>) value;
             return stringList;
         } else {
             throw new IllegalArgumentException("property [" + propertyName + "] isn't a list, but of type [" + value.getClass().getName() + "]");
         }
     }
 
+
     /**
      * Returns and removes the specified property of type map from the specified configuration map.
      *

plugins/ingest/src/main/java/org/elasticsearch/ingest/processor/Processor.java

@@ -38,6 +38,11 @@ public interface Processor {
      */
     void execute(Data data);
 
+    /**
+     * Gets the type of a processor
+     */
+    String getType();
+
     /**
      * A factory that knows how to construct a processor based on a map of maps.
      */
@@ -54,6 +59,7 @@ public interface Processor {
         default void setConfigDirectory(Path configDirectory) {
         }
 
+
         @Override
         default void close() throws IOException {
         }

plugins/ingest/src/main/java/org/elasticsearch/ingest/processor/date/DateProcessor.java

@@ -78,6 +78,11 @@ public final class DateProcessor implements Processor {
         data.addField(targetField, ISODateTimeFormat.dateTime().print(dateTime));
     }
 
+    @Override
+    public String getType() {
+        return TYPE;
+    }
+
     DateTimeZone getTimezone() {
         return timezone;
     }
@@ -108,7 +113,7 @@ public final class DateProcessor implements Processor {
             DateTimeZone timezone = timezoneString == null ? DateTimeZone.UTC : DateTimeZone.forID(timezoneString);
             String localeString = ConfigurationUtils.readOptionalStringProperty(config, "locale");
             Locale locale = localeString == null ? Locale.ENGLISH : Locale.forLanguageTag(localeString);
-            List<String> matchFormats = ConfigurationUtils.readStringList(config, "match_formats");
+            List<String> matchFormats = ConfigurationUtils.readList(config, "match_formats");
             return new DateProcessor(timezone, locale, matchField, matchFormats, targetField);
         }
     }

plugins/ingest/src/main/java/org/elasticsearch/ingest/processor/geoip/GeoIpProcessor.java

@@ -40,7 +40,7 @@ import java.security.AccessController;
 import java.security.PrivilegedAction;
 import java.util.*;
 
-import static org.elasticsearch.ingest.processor.ConfigurationUtils.readStringList;
+import static org.elasticsearch.ingest.processor.ConfigurationUtils.readList;
 import static org.elasticsearch.ingest.processor.ConfigurationUtils.readStringProperty;
 
 public final class GeoIpProcessor implements Processor {
@@ -91,6 +91,11 @@ public final class GeoIpProcessor implements Processor {
         data.addField(targetField, geoData);
     }
 
+    @Override
+    public String getType() {
+        return TYPE;
+    }
+
     String getSourceField() {
         return sourceField;
     }
@@ -222,7 +227,7 @@ public final class GeoIpProcessor implements Processor {
             final Set<Field> fields;
             if (config.containsKey("fields")) {
                 fields = EnumSet.noneOf(Field.class);
-                List<String> fieldNames = readStringList(config, "fields");
+                List<String> fieldNames = readList(config, "fields");
                 for (String fieldName : fieldNames) {
                     try {
                         fields.add(Field.parse(fieldName));

plugins/ingest/src/main/java/org/elasticsearch/ingest/processor/grok/GrokProcessor.java

@@ -56,6 +56,11 @@ public final class GrokProcessor implements Processor {
         }
     }
 
+    @Override
+    public String getType() {
+        return TYPE;
+    }
+
     String getMatchField() {
         return matchField;
     }

plugins/ingest/src/main/java/org/elasticsearch/ingest/processor/mutate/MutateProcessor.java

@@ -134,6 +134,11 @@ public final class MutateProcessor implements Processor {
         }
     }
 
+    @Override
+    public String getType() {
+        return TYPE;
+    }
+
     private void doUpdate(Data data) {
         for(Map.Entry<String, Object> entry : update.entrySet()) {
             data.addField(entry.getKey(), entry.getValue());
@@ -272,6 +277,28 @@ public final class MutateProcessor implements Processor {
         }
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        MutateProcessor that = (MutateProcessor) o;
+        return Objects.equals(update, that.update) &&
+                Objects.equals(rename, that.rename) &&
+                Objects.equals(convert, that.convert) &&
+                Objects.equals(split, that.split) &&
+                Objects.equals(gsub, that.gsub) &&
+                Objects.equals(join, that.join) &&
+                Objects.equals(remove, that.remove) &&
+                Objects.equals(trim, that.trim) &&
+                Objects.equals(uppercase, that.uppercase) &&
+                Objects.equals(lowercase, that.lowercase);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(update, rename, convert, split, gsub, join, remove, trim, uppercase, lowercase);
+    }
+
     public static final class Factory implements Processor.Factory<MutateProcessor> {
         @Override
         public MutateProcessor create(Map<String, Object> config) throws IOException {
@@ -281,10 +308,10 @@ public final class MutateProcessor implements Processor {
             Map<String, String> split = ConfigurationUtils.readOptionalMap(config, "split");
             Map<String, List<String>> gsubConfig = ConfigurationUtils.readOptionalMap(config, "gsub");
             Map<String, String> join = ConfigurationUtils.readOptionalMap(config, "join");
-            List<String> remove = ConfigurationUtils.readOptionalStringList(config, "remove");
+            List<String> remove = ConfigurationUtils.readOptionalList(config, "remove");
-            List<String> trim = ConfigurationUtils.readOptionalStringList(config, "trim");
+            List<String> trim = ConfigurationUtils.readOptionalList(config, "trim");
-            List<String> uppercase = ConfigurationUtils.readOptionalStringList(config, "uppercase");
+            List<String> uppercase = ConfigurationUtils.readOptionalList(config, "uppercase");
-            List<String> lowercase = ConfigurationUtils.readOptionalStringList(config, "lowercase");
+            List<String> lowercase = ConfigurationUtils.readOptionalList(config, "lowercase");
 
             // pre-compile regex patterns
             List<GsubExpression> gsubExpressions = null;

plugins/ingest/src/main/java/org/elasticsearch/plugin/ingest/IngestModule.java

@@ -27,6 +27,7 @@ import org.elasticsearch.ingest.processor.geoip.GeoIpProcessor;
 import org.elasticsearch.ingest.processor.grok.GrokProcessor;
 import org.elasticsearch.ingest.processor.mutate.MutateProcessor;
 import org.elasticsearch.plugin.ingest.rest.IngestRestFilter;
+import org.elasticsearch.plugin.ingest.simulate.SimulateExecutionService;
 
 import java.util.HashMap;
 import java.util.Map;
@@ -41,6 +42,7 @@ public class IngestModule extends AbstractModule {
         binder().bind(PipelineExecutionService.class).asEagerSingleton();
         binder().bind(PipelineStore.class).asEagerSingleton();
         binder().bind(PipelineStoreClient.class).asEagerSingleton();
+        binder().bind(SimulateExecutionService.class).asEagerSingleton();
 
         addProcessor(GeoIpProcessor.TYPE, new GeoIpProcessor.Factory());
         addProcessor(GrokProcessor.TYPE, new GrokProcessor.Factory());

plugins/ingest/src/main/java/org/elasticsearch/plugin/ingest/PipelineExecutionService.java

@@ -25,11 +25,8 @@ import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.util.concurrent.EsExecutors;
 import org.elasticsearch.ingest.Data;
 import org.elasticsearch.ingest.Pipeline;
-import org.elasticsearch.ingest.processor.Processor;
 import org.elasticsearch.threadpool.ThreadPool;
 
-import java.util.Map;
-
 public class PipelineExecutionService {
 
     static final String THREAD_POOL_NAME = IngestPlugin.NAME;
@@ -43,25 +40,13 @@ public class PipelineExecutionService {
         this.threadPool = threadPool;
     }
 
-    public Pipeline getPipeline(String pipelineId) {
-        Pipeline pipeline = store.get(pipelineId);
-
-        if (pipeline == null) {
-            throw new IllegalArgumentException(LoggerMessageFormat.format("pipeline with id [{}] does not exist", pipelineId));
-        }
-
-        return pipeline;
-    }
-
     public void execute(Data data, String pipelineId, Listener listener) {
-        try {
+        Pipeline pipeline = store.get(pipelineId);
-            execute(data, getPipeline(pipelineId), listener);
+        if (pipeline == null) {
-        } catch (IllegalArgumentException e) {
+            listener.failed(new IllegalArgumentException(LoggerMessageFormat.format("pipeline with id [{}] does not exist", pipelineId)));
-            listener.failed(e);
+            return;
         }
-    }
 
-    public void execute(Data data, Pipeline pipeline, Listener listener) {
         threadPool.executor(THREAD_POOL_NAME).execute(new Runnable() {
             @Override
             public void run() {

plugins/ingest/src/main/java/org/elasticsearch/plugin/ingest/rest/RestSimulatePipelineAction.java

@@ -28,6 +28,7 @@ import org.elasticsearch.rest.BaseRestHandler;
 import org.elasticsearch.rest.RestChannel;
 import org.elasticsearch.rest.RestController;
 import org.elasticsearch.rest.RestRequest;
+import org.elasticsearch.rest.action.support.RestActions;
 import org.elasticsearch.rest.action.support.RestStatusToXContentListener;
 
 public class RestSimulatePipelineAction extends BaseRestHandler {
@@ -37,15 +38,20 @@ public class RestSimulatePipelineAction extends BaseRestHandler {
         super(settings, controller, client);
         controller.registerHandler(RestRequest.Method.POST, "/_ingest/pipeline/{id}/_simulate", this);
         controller.registerHandler(RestRequest.Method.POST, "/_ingest/pipeline/_simulate", this);
+        // controller.registerHandler(RestRequest.Method.GET, "/_ingest/pipeline/{id}/_simulate", this);
+        // controller.registerHandler(RestRequest.Method.GET, "/_ingest/pipeline/_simulate", this);
     }
 
     @Override
     protected void handleRequest(RestRequest restRequest, RestChannel channel, Client client) throws Exception {
         SimulatePipelineRequest request = new SimulatePipelineRequest();
         request.id(restRequest.param("id"));
-        if (restRequest.hasContent()) {
+        request.verbose(restRequest.paramAsBoolean("verbose", false));
-            request.source(restRequest.content());
+
+        if (RestActions.hasBodyContent(restRequest)) {
+            request.source(RestActions.getRestContent(restRequest));
         }
+
         client.execute(SimulatePipelineAction.INSTANCE, request, new RestStatusToXContentListener<>(channel));
     }
 }

plugins/ingest/src/main/java/org/elasticsearch/plugin/ingest/simulate/ParsedSimulateRequest.java

@@ -0,0 +1,101 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.elasticsearch.plugin.ingest.simulate;
+
+import org.elasticsearch.ingest.Data;
+import org.elasticsearch.ingest.Pipeline;
+import org.elasticsearch.ingest.processor.ConfigurationUtils;
+import org.elasticsearch.plugin.ingest.PipelineStore;
+
+import java.io.IOException;
+import java.util.*;
+
+public class ParsedSimulateRequest {
+    private final List<Data> documents;
+    private final Pipeline pipeline;
+    private final boolean verbose;
+
+    ParsedSimulateRequest(Pipeline pipeline, List<Data> documents, boolean verbose) {
+        this.pipeline = pipeline;
+        this.documents = Collections.unmodifiableList(documents);
+        this.verbose = verbose;
+    }
+
+    public Pipeline getPipeline() {
+        return pipeline;
+    }
+
+    public List<Data> getDocuments() {
+        return documents;
+    }
+
+    public boolean isVerbose() {
+        return verbose;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        ParsedSimulateRequest that = (ParsedSimulateRequest) o;
+        return Objects.equals(verbose, that.verbose) &&
+                Objects.equals(documents, that.documents) &&
+                Objects.equals(pipeline, that.pipeline);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(documents, pipeline, verbose);
+    }
+
+    public static class Parser {
+        private static final Pipeline.Factory PIPELINE_FACTORY = new Pipeline.Factory();
+        public static final String SIMULATED_PIPELINE_ID = "_simulate_pipeline";
+
+        public ParsedSimulateRequest parse(String pipelineId, Map<String, Object> config, boolean verbose, PipelineStore pipelineStore) throws IOException {
+            Pipeline pipeline;
+            // if pipeline `id` passed to request, fetch pipeline from store.
+            if (pipelineId != null) {
+                pipeline = pipelineStore.get(pipelineId);
+            } else {
+                Map<String, Object> pipelineConfig = ConfigurationUtils.readOptionalMap(config, "pipeline");
+                pipeline = PIPELINE_FACTORY.create(SIMULATED_PIPELINE_ID, pipelineConfig, pipelineStore.getProcessorFactoryRegistry());
+            }
+
+            List<Map<String, Object>> docs = ConfigurationUtils.readList(config, "docs");
+
+            List<Data> dataList = new ArrayList<>();
+
+            for (int i = 0; i < docs.size(); i++) {
+                Map<String, Object> dataMap = docs.get(i);
+                Map<String, Object> document = ConfigurationUtils.readOptionalMap(dataMap, "_source");
+                if (document == null) {
+                    document = Collections.emptyMap();
+                }
+                Data data = new Data(ConfigurationUtils.readOptionalStringProperty(dataMap, "_index"),
+                        ConfigurationUtils.readOptionalStringProperty(dataMap, "_type"),
+                        ConfigurationUtils.readOptionalStringProperty(dataMap, "_id"),
+                        document);
+                dataList.add(data);
+            }
+
+            return new ParsedSimulateRequest(pipeline, dataList, verbose);
+        }
+    }
+}

plugins/ingest/src/main/java/org/elasticsearch/plugin/ingest/simulate/ProcessedData.java

@@ -16,7 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-package org.elasticsearch.plugin.ingest.transport.simulate;
+package org.elasticsearch.plugin.ingest.simulate;
 
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
@@ -31,24 +31,26 @@ import java.io.IOException;
 import java.util.Map;
 import java.util.Objects;
 
-public class SimulatedItemResponse implements Streamable, StatusToXContent {
+public class ProcessedData implements Streamable, StatusToXContent {
 
+    private String processorId;
     private Data data;
     private Throwable failure;
 
-    public SimulatedItemResponse() {
+    public ProcessedData() {
 
     }
 
-    public SimulatedItemResponse(Data data) {
+    public ProcessedData(String processorId, Data data) {
+        this.processorId = processorId;
         this.data = data;
     }
 
-    public SimulatedItemResponse(Throwable failure) {
+    public ProcessedData(Throwable failure) {
         this.failure = failure;
     }
 
-    public boolean failed() {
+    public boolean isFailed() {
         return this.failure != null;
     }
 
@@ -56,14 +58,18 @@ public class SimulatedItemResponse implements Streamable, StatusToXContent {
         return data;
     }
 
+    public String getProcessorId() {
+        return processorId;
+    }
+
     @Override
     public void readFrom(StreamInput in) throws IOException {
-        boolean failed = in.readBoolean();
+        boolean isFailure = in.readBoolean();
-
+        if (isFailure) {
-        if (failed) {
             this.failure = in.readThrowable();
             // TODO(talevy): check out mget for throwable limitations
         } else {
+            this.processorId = in.readString();
             String index = in.readString();
             String type = in.readString();
             String id = in.readString();
@@ -74,11 +80,11 @@ public class SimulatedItemResponse implements Streamable, StatusToXContent {
 
     @Override
     public void writeTo(StreamOutput out) throws IOException {
-        out.writeBoolean(failed());
+        out.writeBoolean(isFailed());
-
+        if (isFailed()) {
-        if (failed()) {
             out.writeThrowable(failure);
         } else {
+            out.writeString(processorId);
             out.writeString(data.getIndex());
             out.writeString(data.getType());
             out.writeString(data.getId());
@@ -89,8 +95,9 @@ public class SimulatedItemResponse implements Streamable, StatusToXContent {
     @Override
     public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
         builder.startObject();
-        builder.field(Fields.ERROR, failed());
+        builder.field(Fields.PROCESSOR_ID, processorId);
-        if (failed()) {
+        builder.field(Fields.ERROR, isFailed());
+        if (isFailed()) {
             builder.field(Fields.FAILURE, failure.toString());
         } else {
             builder.field(Fields.MODIFIED, data.isModified());
@@ -102,7 +109,7 @@ public class SimulatedItemResponse implements Streamable, StatusToXContent {
 
     @Override
     public RestStatus status() {
-        if (failed()) {
+        if (isFailed()) {
             return RestStatus.BAD_REQUEST;
         } else {
             return RestStatus.OK;
@@ -115,17 +122,18 @@ public class SimulatedItemResponse implements Streamable, StatusToXContent {
         if (obj == null || getClass() != obj.getClass()) {
             return false;
         }
-        SimulatedItemResponse other = (SimulatedItemResponse) obj;
+        ProcessedData other = (ProcessedData) obj;
-        return Objects.equals(data, other.data) && Objects.equals(failure, other.failure);
+        return Objects.equals(processorId, other.processorId) && Objects.equals(data, other.data) && Objects.equals(failure, other.failure);
     }
 
     @Override
     public int hashCode() {
-        return Objects.hash(data, failure);
+        return Objects.hash(processorId, data, failure);
     }
 
     static final class Fields {
         static final XContentBuilderString DOCUMENT = new XContentBuilderString("doc");
+        static final XContentBuilderString PROCESSOR_ID = new XContentBuilderString("processor_id");
         static final XContentBuilderString ERROR = new XContentBuilderString("error");
         static final XContentBuilderString FAILURE = new XContentBuilderString("failure");
         static final XContentBuilderString MODIFIED = new XContentBuilderString("modified");

plugins/ingest/src/main/java/org/elasticsearch/plugin/ingest/simulate/SimulateExecutionService.java

@@ -0,0 +1,94 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.plugin.ingest.simulate;
+
+import org.elasticsearch.common.inject.Inject;
+import org.elasticsearch.ingest.Data;
+import org.elasticsearch.ingest.Pipeline;
+import org.elasticsearch.ingest.processor.Processor;
+import org.elasticsearch.plugin.ingest.transport.simulate.SimulatePipelineResponse;
+import org.elasticsearch.threadpool.ThreadPool;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class SimulateExecutionService {
+
+    static final String THREAD_POOL_NAME = ThreadPool.Names.MANAGEMENT;
+
+    private final ThreadPool threadPool;
+
+    @Inject
+    public SimulateExecutionService(ThreadPool threadPool) {
+        this.threadPool = threadPool;
+    }
+
+
+    SimulatedItemResponse executeItem(Pipeline pipeline, Data data, boolean verbose) {
+        try {
+            if (verbose) {
+                return executeVerboseItem(pipeline, data);
+            } else {
+                pipeline.execute(data);
+                return new SimulatedItemResponse(data);
+            }
+        } catch (Exception e) {
+            return new SimulatedItemResponse(e);
+        }
+
+    }
+
+    SimulatedItemResponse executeVerboseItem(Pipeline pipeline, Data data) {
+        List<ProcessedData> processedDataList = new ArrayList<>();
+        Data currentData = new Data(data);
+        for (int i = 0; i < pipeline.getProcessors().size(); i++) {
+            Processor processor = pipeline.getProcessors().get(i);
+            String processorId = "processor[" + processor.getType() + "]-" + i;
+
+            processor.execute(currentData);
+            processedDataList.add(new ProcessedData(processorId, currentData));
+
+            currentData = new Data(currentData);
+        }
+        return new SimulatedItemResponse(processedDataList);
+    }
+
+    SimulatePipelineResponse execute(ParsedSimulateRequest request) {
+        List<SimulatedItemResponse> responses = new ArrayList<>();
+        for (Data data : request.getDocuments()) {
+            responses.add(executeItem(request.getPipeline(), data, request.isVerbose()));
+        }
+        return new SimulatePipelineResponse(request.getPipeline().getId(), responses);
+    }
+
+    public void execute(ParsedSimulateRequest request, Listener listener) {
+        threadPool.executor(THREAD_POOL_NAME).execute(new Runnable() {
+            @Override
+            public void run() {
+                SimulatePipelineResponse response = execute(request);
+                listener.onResponse(response);
+            }
+        });
+    }
+
+    public interface Listener {
+        void onResponse(SimulatePipelineResponse response);
+    }
+}

plugins/ingest/src/main/java/org/elasticsearch/plugin/ingest/simulate/SimulatedItemResponse.java

@@ -0,0 +1,171 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.elasticsearch.plugin.ingest.simulate;
+
+import org.elasticsearch.common.io.stream.StreamInput;
+import org.elasticsearch.common.io.stream.StreamOutput;
+import org.elasticsearch.common.io.stream.Streamable;
+import org.elasticsearch.common.xcontent.StatusToXContent;
+import org.elasticsearch.common.xcontent.XContentBuilder;
+import org.elasticsearch.common.xcontent.XContentBuilderString;
+import org.elasticsearch.ingest.Data;
+import org.elasticsearch.rest.RestStatus;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+
+public class SimulatedItemResponse implements Streamable, StatusToXContent {
+
+    private Data data;
+    private List<ProcessedData> processedDataList;
+    private Throwable failure;
+
+    public SimulatedItemResponse() {
+
+    }
+
+    public SimulatedItemResponse(Data data) {
+        this.data = data;
+    }
+
+    public SimulatedItemResponse(List<ProcessedData> processedDataList) {
+        this.processedDataList = processedDataList;
+    }
+
+    public SimulatedItemResponse(Throwable failure) {
+        this.failure = failure;
+    }
+
+    public boolean isFailed() {
+        return this.failure != null;
+    }
+
+    public boolean isVerbose() {
+        return this.processedDataList != null;
+    }
+
+    public Data getData() {
+        return data;
+    }
+
+    public List<ProcessedData> getProcessedDataList() {
+        return processedDataList;
+    }
+
+    @Override
+    public void readFrom(StreamInput in) throws IOException {
+        boolean isFailed = in.readBoolean();
+        boolean isVerbose = in.readBoolean();
+        if (isFailed) {
+            this.failure = in.readThrowable();
+            // TODO(talevy): check out mget for throwable limitations
+        } else if (isVerbose) {
+            int size = in.readVInt();
+            processedDataList = new ArrayList<>();
+            for (int i = 0; i < size; i++) {
+                ProcessedData processedData = new ProcessedData();
+                processedData.readFrom(in);
+                processedDataList.add(processedData);
+            }
+        } else {
+            String index = in.readString();
+            String type = in.readString();
+            String id = in.readString();
+            Map<String, Object> doc = in.readMap();
+            this.data = new Data(index, type, id, doc);
+        }
+    }
+
+    @Override
+    public void writeTo(StreamOutput out) throws IOException {
+        out.writeBoolean(isFailed());
+        out.writeBoolean(isVerbose());
+
+        if (isFailed()) {
+            out.writeThrowable(failure);
+        } else if (isVerbose()) {
+            out.writeVInt(processedDataList.size());
+            for (ProcessedData p : processedDataList) {
+                p.writeTo(out);
+            }
+        } else {
+            out.writeString(data.getIndex());
+            out.writeString(data.getType());
+            out.writeString(data.getId());
+            out.writeMap(data.getDocument());
+        }
+    }
+
+    @Override
+    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
+        builder.startObject();
+        builder.field(Fields.ERROR, isFailed());
+        builder.field(Fields.VERBOSE, isVerbose());
+        if (isFailed()) {
+            builder.field(Fields.FAILURE, failure.toString());
+        } else if (isVerbose()) {
+            builder.startArray(Fields.PROCESSOR_STEPS);
+            for (ProcessedData processedData : processedDataList) {
+                builder.value(processedData);
+            }
+            builder.endArray();
+        } else {
+            builder.field(Fields.MODIFIED, data.isModified());
+            builder.field(Fields.DOCUMENT, data.getDocument());
+        }
+        builder.endObject();
+        return builder;
+    }
+
+    @Override
+    public RestStatus status() {
+        if (isFailed()) {
+            return RestStatus.BAD_REQUEST;
+        } else {
+            return RestStatus.OK;
+        }
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) { return true; }
+        if (obj == null || getClass() != obj.getClass()) {
+            return false;
+        }
+        SimulatedItemResponse other = (SimulatedItemResponse) obj;
+        return Objects.equals(data, other.data) && Objects.equals(processedDataList, other.processedDataList) && Objects.equals(failure, other.failure);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(data, processedDataList, failure);
+    }
+
+    static final class Fields {
+        static final XContentBuilderString DOCUMENT = new XContentBuilderString("doc");
+        static final XContentBuilderString ERROR = new XContentBuilderString("error");
+        static final XContentBuilderString VERBOSE = new XContentBuilderString("verbose");
+        static final XContentBuilderString FAILURE = new XContentBuilderString("failure");
+        static final XContentBuilderString MODIFIED = new XContentBuilderString("modified");
+        static final XContentBuilderString PROCESSOR_STEPS = new XContentBuilderString("processor_steps");
+    }
+}

plugins/ingest/src/main/java/org/elasticsearch/plugin/ingest/transport/simulate/SimulatePipelineRequest.java

@@ -32,6 +32,7 @@ import static org.elasticsearch.action.ValidateActions.addValidationError;
 public class SimulatePipelineRequest extends ActionRequest {
 
     private String id;
+    private boolean verbose;
     private BytesReference source;
 
     @Override
@@ -51,6 +52,14 @@ public class SimulatePipelineRequest extends ActionRequest {
         this.id = id;
     }
 
+    public boolean verbose() {
+        return verbose;
+    }
+
+    public void verbose(boolean verbose) {
+        this.verbose = verbose;
+    }
+
     public BytesReference source() {
         return source;
     }
@@ -63,6 +72,7 @@ public class SimulatePipelineRequest extends ActionRequest {
     public void readFrom(StreamInput in) throws IOException {
         super.readFrom(in);
         id = in.readString();
+        verbose = in.readBoolean();
         source = in.readBytesReference();
     }
 
@@ -70,6 +80,7 @@ public class SimulatePipelineRequest extends ActionRequest {
     public void writeTo(StreamOutput out) throws IOException {
         super.writeTo(out);
         out.writeString(id);
+        out.writeBoolean(verbose);
         out.writeBytesReference(source);
     }
 }

plugins/ingest/src/main/java/org/elasticsearch/plugin/ingest/transport/simulate/SimulatePipelineRequestBuilder.java

@@ -34,6 +34,11 @@ public class SimulatePipelineRequestBuilder extends ActionRequestBuilder<Simulat
         return this;
     }
 
+    public SimulatePipelineRequestBuilder setVerbose(boolean verbose) {
+        request.verbose(verbose);
+        return this;
+    }
+
     public SimulatePipelineRequestBuilder setSource(BytesReference source) {
         request.source(source);
         return this;

plugins/ingest/src/main/java/org/elasticsearch/plugin/ingest/transport/simulate/SimulatePipelineRequestPayload.java

@@ -1,99 +0,0 @@
-/*
- * Licensed to Elasticsearch under one or more contributor
- * license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright
- * ownership. Elasticsearch licenses this file to you under
- * the Apache License, Version 2.0 (the "License"); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-package org.elasticsearch.plugin.ingest.transport.simulate;
-
-import org.elasticsearch.ingest.Data;
-import org.elasticsearch.ingest.Pipeline;
-import org.elasticsearch.ingest.processor.ConfigurationUtils;
-import org.elasticsearch.plugin.ingest.PipelineExecutionService;
-import org.elasticsearch.plugin.ingest.PipelineStore;
-
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-import java.util.Map;
-
-public class SimulatePipelineRequestPayload {
-
-    private final List<Data> documents;
-    private final Pipeline pipeline;
-
-    public SimulatePipelineRequestPayload(Pipeline pipeline, List<Data> documents) {
-        this.pipeline = pipeline;
-        this.documents = Collections.unmodifiableList(documents);
-    }
-
-    public String pipelineId() {
-        return pipeline.getId();
-    }
-
-    public Pipeline pipeline() {
-        return pipeline;
-    }
-
-
-    public List<Data> documents() {
-        return documents;
-    }
-
-    public SimulatePipelineResponse execute() {
-        List<SimulatedItemResponse> responses = new ArrayList<>();
-        for (Data data : documents) {
-            try {
-                pipeline.execute(data);
-                responses.add(new SimulatedItemResponse(data));
-            } catch (Exception e) {
-                responses.add(new SimulatedItemResponse(e));
-            }
-        }
-        return new SimulatePipelineResponse(pipeline.getId(), responses);
-    }
-
-    public static class Factory {
-
-        public SimulatePipelineRequestPayload create(String pipelineId, Map<String, Object> config, PipelineStore pipelineStore) throws IOException {
-            Pipeline pipeline;
-            // if pipeline `id` passed to request, fetch pipeline from store.
-            if (pipelineId != null) {
-                pipeline = pipelineStore.get(pipelineId);
-            } else {
-                Map<String, Object> pipelineConfig = (Map<String, Object>) config.get("pipeline");
-                pipeline = (new Pipeline.Factory()).create("_pipeline_id", pipelineConfig, pipelineStore.getProcessorFactoryRegistry());
-            }
-
-            // distribute docs by shard key to SimulateShardPipelineResponse
-            List<Map<String, Object>> docs = (List<Map<String, Object>>) config.get("docs");
-
-            List<Data> dataList = new ArrayList<>();
-
-            for (int i = 0; i < docs.size(); i++) {
-                Map<String, Object> dataMap = docs.get(i);
-                Map<String, Object> document = (Map<String, Object>) dataMap.get("_source");
-                Data data = new Data(ConfigurationUtils.readStringProperty(dataMap, "_index", null),
-                        ConfigurationUtils.readStringProperty(dataMap, "_type", null),
-                        ConfigurationUtils.readStringProperty(dataMap, "_id", null),
-                        document);
-                dataList.add(data);
-            }
-
-            return new SimulatePipelineRequestPayload(pipeline, dataList);
-        }
-    }
-}

plugins/ingest/src/main/java/org/elasticsearch/plugin/ingest/transport/simulate/SimulatePipelineResponse.java

@@ -24,6 +24,7 @@ import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.xcontent.StatusToXContent;
 import org.elasticsearch.common.xcontent.XContentBuilder;
+import org.elasticsearch.plugin.ingest.simulate.SimulatedItemResponse;
 import org.elasticsearch.rest.RestStatus;
 
 import java.io.IOException;
@@ -100,7 +101,7 @@ public class SimulatePipelineResponse extends ActionResponse implements StatusTo
     @Override
     public RestStatus status() {
         for (SimulatedItemResponse response : responses) {
-            if (response.failed()) {
+            if (response.isFailed()) {
                 return RestStatus.BAD_REQUEST;
             }
         }

plugins/ingest/src/main/java/org/elasticsearch/plugin/ingest/transport/simulate/SimulatePipelineTransportAction.java

@@ -26,7 +26,10 @@ import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
 import org.elasticsearch.common.inject.Inject;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.xcontent.XContentHelper;
+import org.elasticsearch.ingest.Pipeline;
+import org.elasticsearch.plugin.ingest.simulate.ParsedSimulateRequest;
 import org.elasticsearch.plugin.ingest.PipelineStore;
+import org.elasticsearch.plugin.ingest.simulate.SimulateExecutionService;
 import org.elasticsearch.threadpool.ThreadPool;
 import org.elasticsearch.transport.TransportService;
 
@@ -34,32 +37,33 @@ import java.io.IOException;
 import java.util.Map;
 
 public class SimulatePipelineTransportAction extends HandledTransportAction<SimulatePipelineRequest, SimulatePipelineResponse> {
-
     private final PipelineStore pipelineStore;
+    private final SimulateExecutionService executionService;
 
     @Inject
-    public SimulatePipelineTransportAction(Settings settings, ThreadPool threadPool, TransportService transportService, ActionFilters actionFilters, IndexNameExpressionResolver indexNameExpressionResolver, PipelineStore pipelineStore) {
+    public SimulatePipelineTransportAction(Settings settings, ThreadPool threadPool, TransportService transportService, ActionFilters actionFilters, IndexNameExpressionResolver indexNameExpressionResolver, PipelineStore pipelineStore, SimulateExecutionService executionService) {
         super(settings, SimulatePipelineAction.NAME, threadPool, transportService, actionFilters, indexNameExpressionResolver, SimulatePipelineRequest::new);
         this.pipelineStore = pipelineStore;
+        this.executionService = executionService;
     }
 
     @Override
     protected void doExecute(SimulatePipelineRequest request, ActionListener<SimulatePipelineResponse> listener) {
         Map<String, Object> source = XContentHelper.convertToMap(request.source(), false).v2();
 
-        SimulatePipelineRequestPayload payload;
+        ParsedSimulateRequest payload;
-        SimulatePipelineRequestPayload.Factory factory = new SimulatePipelineRequestPayload.Factory();
+        ParsedSimulateRequest.Parser parser = new ParsedSimulateRequest.Parser();
         try {
-            payload = factory.create(request.id(), source, pipelineStore);
+            payload = parser.parse(request.id(), source, request.verbose(), pipelineStore);
         } catch (IOException e) {
             listener.onFailure(e);
             return;
         }
 
-        threadPool.executor(ThreadPool.Names.MANAGEMENT).execute(new Runnable() {
+        executionService.execute(payload, new SimulateExecutionService.Listener() {
             @Override
-            public void run() {
+            public void onResponse(SimulatePipelineResponse response) {
-                listener.onResponse(payload.execute());
+                listener.onResponse(response);
             }
         });
     }

plugins/ingest/src/test/java/org/elasticsearch/ingest/IngestClientIT.java

@@ -33,7 +33,7 @@ import org.elasticsearch.plugin.ingest.transport.put.PutPipelineRequestBuilder;
 import org.elasticsearch.plugin.ingest.transport.simulate.SimulatePipelineAction;
 import org.elasticsearch.plugin.ingest.transport.simulate.SimulatePipelineRequestBuilder;
 import org.elasticsearch.plugin.ingest.transport.simulate.SimulatePipelineResponse;
-import org.elasticsearch.plugin.ingest.transport.simulate.SimulatedItemResponse;
+import org.elasticsearch.plugin.ingest.simulate.SimulatedItemResponse;
 import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.test.ESIntegTestCase;
 

plugins/ingest/src/test/java/org/elasticsearch/ingest/processor/ConfigurationUtilsTests.java

@@ -59,7 +59,7 @@ public class ConfigurationUtilsTests extends ESTestCase {
 
     // TODO(talevy): Issue with generics. This test should fail, "int" is of type List<Integer>
     public void testOptional_InvalidType() {
-        List<String> val = ConfigurationUtils.readStringList(config, "int");
+        List<String> val = ConfigurationUtils.readList(config, "int");
         assertThat(val, equalTo(Arrays.asList(2)));
     }
 }

plugins/ingest/src/test/java/org/elasticsearch/plugin/ingest/simulate/ParsedSimulateRequestParserTests.java

@@ -0,0 +1,97 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.plugin.ingest.simulate;
+
+import org.elasticsearch.ingest.Data;
+import org.elasticsearch.ingest.Pipeline;
+import org.elasticsearch.ingest.processor.Processor;
+import org.elasticsearch.ingest.processor.mutate.MutateProcessor;
+import org.elasticsearch.plugin.ingest.PipelineStore;
+import org.elasticsearch.test.ESTestCase;
+import org.junit.Before;
+
+import java.io.IOException;
+import java.util.*;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+public class ParsedSimulateRequestParserTests extends ESTestCase {
+    private static final ParsedSimulateRequest.Parser PARSER = new ParsedSimulateRequest.Parser();
+
+    private Map<String, Processor.Factory> processorRegistry;
+    private PipelineStore store;
+    private Processor processor;
+    private Pipeline pipeline;
+    private Data data;
+
+    @Before
+    public void init() throws IOException {
+        List<String> uppercase = Collections.unmodifiableList(Collections.singletonList("foo"));
+        processor = new MutateProcessor(null, null, null, null, null, null, null, null, uppercase, null);
+        pipeline = new Pipeline(ParsedSimulateRequest.Parser.SIMULATED_PIPELINE_ID, null, Collections.unmodifiableList(Arrays.asList(processor)));
+        data = new Data("_index", "_type", "_id", Collections.emptyMap());
+        processorRegistry = new HashMap<>();
+        processorRegistry.put("mutate", new MutateProcessor.Factory());
+        store = mock(PipelineStore.class);
+        when(store.get("_id")).thenReturn(pipeline);
+        when(store.getProcessorFactoryRegistry()).thenReturn(processorRegistry);
+    }
+
+    public void testParse_UsingPipelineStore() throws Exception {
+        ParsedSimulateRequest expectedRequest = new ParsedSimulateRequest(pipeline, Collections.singletonList(data), false);
+
+        Map<String, Object> raw = new HashMap<>();
+        List<Map<String, Object>> docs = new ArrayList<>();
+        Map<String, Object> doc = new HashMap<>();
+        doc.put("_index", "_index");
+        doc.put("_type", "_type");
+        doc.put("_id", "_id");
+        docs.add(doc);
+        raw.put("docs", docs);
+
+        ParsedSimulateRequest actualRequest = PARSER.parse("_id", raw, false, store);
+        assertThat(actualRequest, equalTo(expectedRequest));
+    }
+
+    public void testParse_ProvidedPipeline() throws Exception {
+        ParsedSimulateRequest expectedRequest = new ParsedSimulateRequest(pipeline, Collections.singletonList(data), false);
+
+        Map<String, Object> raw = new HashMap<>();
+        List<Map<String, Object>> docs = new ArrayList<>();
+        Map<String, Object> doc = new HashMap<>();
+        doc.put("_index", "_index");
+        doc.put("_type", "_type");
+        doc.put("_id", "_id");
+        docs.add(doc);
+
+        Map<String, Object> processorConfig = new HashMap<>();
+        processorConfig.put("uppercase", Arrays.asList("foo"));
+        Map<String, Object> pipelineConfig = new HashMap<>();
+        pipelineConfig.put("processors", Collections.singletonList(Collections.singletonMap("mutate", processorConfig)));
+
+        raw.put("docs", docs);
+        raw.put("pipeline", pipelineConfig);
+
+        ParsedSimulateRequest actualRequest = PARSER.parse(null, raw, false, store);
+        assertThat(actualRequest, equalTo(expectedRequest));
+    }
+}

plugins/ingest/src/test/java/org/elasticsearch/plugin/ingest/simulate/SimulateExecutionServiceTests.java

@@ -0,0 +1,130 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.plugin.ingest.simulate;
+
+import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.ingest.Data;
+import org.elasticsearch.ingest.Pipeline;
+import org.elasticsearch.ingest.processor.Processor;
+import org.elasticsearch.plugin.ingest.PipelineStore;
+import org.elasticsearch.plugin.ingest.transport.simulate.SimulatePipelineResponse;
+import org.elasticsearch.test.ESTestCase;
+import org.elasticsearch.threadpool.ThreadPool;
+import org.junit.After;
+import org.junit.Before;
+
+import java.util.Arrays;
+import java.util.Collections;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.mockito.Mockito.*;
+
+public class SimulateExecutionServiceTests extends ESTestCase {
+
+    private PipelineStore store;
+    private ThreadPool threadPool;
+    private SimulateExecutionService executionService;
+    private Pipeline pipeline;
+    private Processor processor;
+    private Data data;
+
+    @Before
+    public void setup() {
+        store = mock(PipelineStore.class);
+        threadPool = new ThreadPool(
+                Settings.builder()
+                        .put("name", "_name")
+                        .build()
+        );
+        executionService = new SimulateExecutionService(threadPool);
+        processor = mock(Processor.class);
+        when(processor.getType()).thenReturn("mock");
+        pipeline = new Pipeline("_id", "_description", Arrays.asList(processor, processor));
+        data = new Data("_index", "_type", "_id", Collections.emptyMap());
+    }
+
+    @After
+    public void destroy() {
+        threadPool.shutdown();
+    }
+
+    public void testExecuteVerboseItem() throws Exception {
+        SimulatedItemResponse expectedItemResponse = new SimulatedItemResponse(
+                Arrays.asList(new ProcessedData("processor[mock]-0", data), new ProcessedData("processor[mock]-1", data)));
+        SimulatedItemResponse actualItemResponse = executionService.executeVerboseItem(pipeline, data);
+        verify(processor, times(2)).execute(data);
+        assertThat(actualItemResponse, equalTo(expectedItemResponse));
+    }
+
+    public void testExecuteItem_verboseSuccessful() throws Exception {
+        SimulatedItemResponse expectedItemResponse = new SimulatedItemResponse(
+                Arrays.asList(new ProcessedData("processor[mock]-0", data), new ProcessedData("processor[mock]-1", data)));
+        SimulatedItemResponse actualItemResponse = executionService.executeItem(pipeline, data, true);
+        verify(processor, times(2)).execute(data);
+        assertThat(actualItemResponse, equalTo(expectedItemResponse));
+    }
+
+    public void testExecuteItem_Simple() throws Exception {
+        SimulatedItemResponse expectedItemResponse = new SimulatedItemResponse(data);
+        SimulatedItemResponse actualItemResponse = executionService.executeItem(pipeline, data, false);
+        verify(processor, times(2)).execute(data);
+        assertThat(actualItemResponse, equalTo(expectedItemResponse));
+    }
+
+    public void testExecuteItem_Failure() throws Exception {
+        Exception e = new RuntimeException("processor failed");
+        SimulatedItemResponse expectedItemResponse = new SimulatedItemResponse(e);
+        doThrow(e).when(processor).execute(data);
+        SimulatedItemResponse actualItemResponse = executionService.executeItem(pipeline, data, false);
+        verify(processor, times(1)).execute(data);
+        assertThat(actualItemResponse, equalTo(expectedItemResponse));
+    }
+
+    public void testExecute() throws Exception {
+        SimulateExecutionService.Listener listener = mock(SimulateExecutionService.Listener.class);
+        SimulatedItemResponse itemResponse = new SimulatedItemResponse(data);
+        ParsedSimulateRequest request = new ParsedSimulateRequest(pipeline, Collections.singletonList(data), false);
+        executionService.execute(request, listener);
+        SimulatePipelineResponse response = new SimulatePipelineResponse("_id", Collections.singletonList(itemResponse));
+        assertBusy(new Runnable() {
+            @Override
+            public void run() {
+                verify(processor, times(2)).execute(data);
+                verify(listener).onResponse(response);
+            }
+        });
+    }
+
+    public void testExecute_Verbose() throws Exception {
+        SimulateExecutionService.Listener listener = mock(SimulateExecutionService.Listener.class);
+        ParsedSimulateRequest request = new ParsedSimulateRequest(pipeline, Collections.singletonList(data), true);
+        SimulatedItemResponse itemResponse = new SimulatedItemResponse(
+                Arrays.asList(new ProcessedData("processor[mock]-0", data), new ProcessedData("processor[mock]-1", data)));
+        executionService.execute(request, listener);
+        SimulatePipelineResponse response = new SimulatePipelineResponse("_id", Collections.singletonList(itemResponse));
+        assertBusy(new Runnable() {
+            @Override
+            public void run() {
+                verify(processor, times(2)).execute(data);
+                verify(listener).onResponse(response);
+            }
+        });
+    }
+}

plugins/ingest/src/test/resources/rest-api-spec/api/ingest.simulate.json

@@ -13,6 +13,11 @@
         }
       },
       "params": {
+        "verbose": {
+          "type" : "boolean",
+          "description" : "Verbose mode. Display data output for each processor in executed pipeline",
+          "default" : false
+        }
       }
     },
     "body": {

plugins/ingest/src/test/resources/rest-api-spec/test/ingest/80_simulate.yaml

@@ -12,11 +12,10 @@
             "description": "_description",
             "processors": [
               {
-                "simple" : {
+                "mutate" : {
-                  "path" : "field1",
+                  "update" : {
-                  "expected_value" : "_value",
+                    "field2" : "_value"
-                  "add_field" : "field2",
+                  }
-                  "add_field_value" : "_value"
                 }
               }
             ]
@@ -48,4 +47,144 @@
             ]
           }
   - length: { docs: 1 }
+  - is_false: docs.0.error
+  - is_true: docs.0.modified
+  - match: { docs.0.foo: "bar" }
+  - match: { docs.0.field2: "_value" }
 
+
+---
+"Test simulate with provided pipeline definition":
+  - do:
+      cluster.health:
+          wait_for_status: green
+
+  - do:
+      ingest.simulate:
+        body: >
+          {
+            "pipeline": {
+              "description": "_description",
+              "processors": [
+                {
+                  "mutate" : {
+                    "update" : {
+                      "field2" : "_value"
+                    }
+                  }
+                }
+              ]
+            },
+            "docs": [
+              {
+                "_index": "index",
+                "_type": "type",
+                "_id": "id",
+                "_source": {
+                  "foo": "bar"
+                }
+              }
+            ]
+          }
+  - length: { docs: 1 }
+
+---
+"Test simulate with verbose flag":
+  - do:
+      cluster.health:
+          wait_for_status: green
+
+  - do:
+      ingest.simulate:
+        verbose: true
+        body: >
+          {
+            "pipeline": {
+              "description": "_description",
+              "processors": [
+                {
+                  "mutate" : {
+                    "update" : {
+                      "field2" : "_value"
+                    }
+                  }
+                },
+                {
+                  "mutate" : {
+                    "update" : {
+                      "field3" : "third_val"
+                    }
+                  }
+                }
+              ]
+            },
+            "docs": [
+              {
+                "_index": "index",
+                "_type": "type",
+                "_id": "id",
+                "_source": {
+                  "foo": "bar"
+                }
+              }
+            ]
+          }
+  - length: { docs: 1 }
+  - length: { docs.0.processor_steps: 2 }
+  - match: { docs.0.processor_steps.0.processor_id: "processor[mutate]-0" }
+  - is_false: docs.0.processor_steps.0.error
+  - is_true: docs.0.processor_steps.0.modified
+  - length: { docs.0.processor_steps.0.doc: 2 }
+  - match: { docs.0.processor_steps.0.doc.foo: "bar" }
+  - match: { docs.0.processor_steps.0.doc.field2: "_value" }
+  - length: { docs.0.processor_steps.1.doc: 3 }
+  - match: { docs.0.processor_steps.1.doc.foo: "bar" }
+  - match: { docs.0.processor_steps.1.doc.field2: "_value" }
+  - match: { docs.0.processor_steps.1.doc.field3: "third_val" }
+
+---
+"Test simulate with exception thrown":
+  - do:
+      cluster.health:
+          wait_for_status: green
+
+  - do:
+      catch: request
+      ingest.simulate:
+        body: >
+          {
+            "pipeline": {
+              "description": "_description",
+              "processors": [
+                {
+                  "mutate" : {
+                    "uppercase" : ["foo"]
+                  }
+                }
+              ]
+            },
+            "docs": [
+              {
+                "_index": "index",
+                "_type": "type",
+                "_id": "id",
+                "_source": {
+                  "not_foo": "bar"
+                }
+              },
+              {
+                "_index": "index",
+                "_type": "type",
+                "_id": "id2",
+                "_source": {
+                  "foo": "bar"
+                }
+              }
+            ]
+          }
+  - length: { docs: 2 }
+  - is_true: docs.0.error
+  - match: { docs.0.failure: "java.lang.NullPointerException" }
+  - is_false: docs.1.error
+  - is_true: docs.1.modified
+  - match: { docs.1.doc.foo: "BAR" }