Github user JPercivall commented on a diff in the pull request: https://github.com/apache/nifi/pull/576#discussion_r69308812 --- Diff: nifi-nar-bundles/nifi-elasticsearch-bundle/nifi-elasticsearch-processors/src/main/java/org/apache/nifi/processors/elasticsearch/FetchElasticsearchHttp.java --- @@ -0,0 +1,293 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF 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.apache.nifi.processors.elasticsearch; + +import com.squareup.okhttp.HttpUrl; +import com.squareup.okhttp.OkHttpClient; +import com.squareup.okhttp.Response; +import com.squareup.okhttp.ResponseBody; +import org.apache.commons.lang3.StringUtils; +import org.apache.nifi.annotation.behavior.EventDriven; +import org.apache.nifi.annotation.behavior.InputRequirement; +import org.apache.nifi.annotation.behavior.SupportsBatching; +import org.apache.nifi.annotation.behavior.WritesAttribute; +import org.apache.nifi.annotation.behavior.WritesAttributes; +import org.apache.nifi.annotation.documentation.CapabilityDescription; +import org.apache.nifi.annotation.documentation.Tags; +import org.apache.nifi.annotation.lifecycle.OnScheduled; +import org.apache.nifi.components.PropertyDescriptor; +import org.apache.nifi.flowfile.FlowFile; +import org.apache.nifi.logging.ComponentLog; +import org.apache.nifi.processor.ProcessContext; +import org.apache.nifi.processor.ProcessSession; +import org.apache.nifi.processor.Relationship; +import org.apache.nifi.processor.exception.ProcessException; +import org.apache.nifi.processor.util.StandardValidators; +import org.apache.nifi.stream.io.ByteArrayInputStream; +import org.codehaus.jackson.JsonNode; + +import java.io.IOException; +import java.net.MalformedURLException; +import java.net.URL; +import java.util.ArrayList; +import java.util.Collections; +import java.util.HashSet; +import java.util.List; +import java.util.Set; +import java.util.concurrent.TimeUnit; +import java.util.stream.Collectors; +import java.util.stream.Stream; + + +@InputRequirement(InputRequirement.Requirement.INPUT_ALLOWED) +@EventDriven +@SupportsBatching +@Tags({"elasticsearch", "fetch", "read", "get", "http"}) +@CapabilityDescription("Retrieves a document from Elasticsearch using the specified connection properties and the " + + "identifier of the document to retrieve.") +@WritesAttributes({ + @WritesAttribute(attribute = "filename", description = "The filename attributes is set to the document identifier"), + @WritesAttribute(attribute = "es.index", description = "The Elasticsearch index containing the document"), + @WritesAttribute(attribute = "es.type", description = "The Elasticsearch document type") +}) +public class FetchElasticsearchHttp extends AbstractElasticsearchHttpProcessor { + + private static final String FIELD_INCLUDE_QUERY_PARAM = "_source_include"; + + public static final Relationship REL_SUCCESS = new Relationship.Builder().name("success") + .description("All FlowFiles that are read from Elasticsearch are routed to this relationship").build(); + + public static final Relationship REL_FAILURE = new Relationship.Builder().name("failure") + .description("All FlowFiles that cannot be read from Elasticsearch are routed to this relationship").build(); + + public static final Relationship REL_RETRY = new Relationship.Builder().name("retry") + .description("A FlowFile is routed to this relationship if the document cannot be fetched but attempting the operation again may succeed") + .build(); + + public static final Relationship REL_NOT_FOUND = new Relationship.Builder().name("not found") + .description("A FlowFile is routed to this relationship if the specified document does not exist in the Elasticsearch cluster") + .build(); + + public static final PropertyDescriptor DOC_ID = new PropertyDescriptor.Builder() + .name("Document Identifier") + .description("The identifier for the document to be fetched") --- End diff -- nit pick: Are identifiers a 1-to-1 relationship? If so, I think it should be "of" instead of "for": The identifier of the document to be fetched
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