Github user mattyb149 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/733#discussion_r79832571
--- Diff:
nifi-nar-bundles/nifi-elasticsearch-bundle/nifi-elasticsearch-processors/src/main/java/org/apache/nifi/processors/elasticsearch/ScrollElasticsearchHttp.java
---
@@ -0,0 +1,415 @@
+/*
+ * 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 java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+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.Stateful;
+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.components.state.Scope;
+import org.apache.nifi.components.state.StateManager;
+import org.apache.nifi.components.state.StateMap;
+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 okhttp3.HttpUrl;
+import okhttp3.OkHttpClient;
+import okhttp3.Response;
+import okhttp3.ResponseBody;
+
+@InputRequirement(InputRequirement.Requirement.INPUT_FORBIDDEN)
+@EventDriven
+@SupportsBatching
+@Tags({ "elasticsearch", "query", "scroll", "read", "get", "http" })
+@CapabilityDescription("Scrolls through an Elasticsearch query using the
specified connection properties. "
+ + "This processor is intended to be run on the primary node, and
is designed for scrolling through "
+ + "huge result sets, as in the case of a reindex. The state must
be cleared before another query "
+ + "can be run. Each page of results is returned, wrapped in a
JSON object like so: { \"hits\" : [ <doc1>, <doc2>, <docn> ] }. "
+ + "Note that the full body of each page of documents will be read
into memory before being "
+ + "written to a Flow File for transfer.")
+@WritesAttributes({
+ @WritesAttribute(attribute = "es.index", description = "The
Elasticsearch index containing the document"),
+ @WritesAttribute(attribute = "es.type", description = "The
Elasticsearch document type") })
+@Stateful(description = "After each successful scroll page, the latest
scroll_id is persisted in scrollId as input for the next scroll call. "
+ + "Once the entire query is complete, finishedQuery state will be
set to true, and the processor will not execute unless this is cleared.",
scopes = { Scope.LOCAL })
+public class ScrollElasticsearchHttp extends
AbstractElasticsearchHttpProcessor {
+
+ private static final String FINISHED_QUERY_STATE = "finishedQuery";
+ private static final String SCROLL_ID_STATE = "scrollId";
+ private static final String FIELD_INCLUDE_QUERY_PARAM =
"_source_include";
+ private static final String QUERY_QUERY_PARAM = "q";
+ private static final String SORT_QUERY_PARAM = "sort";
+ private static final String SCROLL_QUERY_PARAM = "scroll";
+ private static final String SCROLL_ID_QUERY_PARAM = "scroll_id";
+ private static final String SIZE_QUERY_PARAM = "size";
+
+ 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. Note that only incoming "
+ + "flow files will be routed to
failure.").build();
+
+ public static final PropertyDescriptor QUERY = new
PropertyDescriptor.Builder()
+ .name("scroll-es-query").displayName("Query")
+ .description("The Lucene-style query to run against
ElasticSearch").required(true)
--- End diff --
It might be helpful to add a trivial example here. Also I couldn't use
something like (username:tiger) to find usernames that contain the word tiger,
I had to use (username:\*tiger\*). Again though, that might be my ES setup,
just wanted to make you aware.
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