Elasticsearch 2.0: how to delete by query in Java - elasticsearch

Question

I am trying to upgrade to ES 2.0. I have downloaed ES 2.0 and installed it on my Windows machine.
In my pom.xml, I have the following:
<dependency>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>2.0.0-rc1</version>
</dependency>
<dependency>
<groupId>org.elasticsearch.plugin</groupId>
<artifactId>delete-by-query</artifactId>
<version>2.0.0-rc1</version>
</dependency>
In my Java code, I did delete by query in the following way when using ES 1.7.3:
StringBuilder b = new StringBuilder("");
b.append("{");
b.append(" \"query\": {");
b.append(" \"term\": {");
b.append(" \"category\": " + category_value );
b.append(" }");
b.append(" }");
b.append("}");
client = getClient();
DeleteByQueryResponse response = client.prepareDeleteByQuery("myindex")
.setTypes("mydocytype")
.setSource(b.toString())
.execute()
.actionGet();
I am hoping to replace this:
DeleteByQueryResponse response = client.prepareDeleteByQuery("myindex")
.setTypes("mydocytype")
.setSource(b.toString())
.execute()
.actionGet();
with ES 2.0 way. Googled but failed to find an example for it. The online API documentation seems too abstract to me. How can I do it?
Another question: Do I have to install delete-by-query plugin in Elasticsearch server?
Thanks for any pointer!
UPDATE
I followed Max's suggestion, and here is what I have now:
First, when create the client, make settings look like the following:
Settings settings = Settings.settingsBuilder()
.put("cluster.name", "mycluster")
.put("plugin.types", DeleteByQueryPlugin.class.getName())
.build();
Second, at the place doing delete-by-query:
DeleteByQueryResponse rsp = new DeleteByQueryRequestBuilder(client, DeleteByQueryAction.INSTANCE)
.setIndices("myindex")
.setTypes("mydoctype")
.setSource(b.toString())
.execute()
.actionGet();
I also installed delete by query plugin by running the following in the root directory of ES:
bin\plugin install delete-by-query
I get errors if I do not install this plugin.
After all these steps, ES related parts work just fine.

Answer 1

plugin.types have been deprecated in ES 2.1.0 (source). So the accepted solution will result in a NullPointerException.
The solution is to use the addPlugin method:
Client client = TransportClient.builder().settings(settings())
.addPlugin(DeleteByQueryPlugin.class)
.build()
.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("host",9300));

Answer 2

I believe you can use this:
DeleteByQueryResponse rsp = new DeleteByQueryRequestBuilder(client, DeleteByQueryAction.INSTANCE)
.setTypes("mydocytype")
.setSource(b.toString())
.execute()
.actionGet();
You have to add plugin type to your settings:
Settings settings = Settings.settingsBuilder()
.put("plugin.types", DeleteByQueryPlugin.class.getName())
If you have remote server you have to install the plugin.

Answer 3

From Elastic 5 in onwards...
final BulkIndexByScrollResponse response = DeleteByQueryAction.INSTANCE.newRequestBuilder(super.transportClient)
.filter(
QueryBuilders.boolQuery()
.must(QueryBuilders.termQuery("_type", "MY_TYPE")) // Trick to define and ensure the type.
.must(QueryBuilders.termQuery("...", "...")))
.source("MY_INDEX")
.get();
return response.getDeleted() > 0;
Oficial documentation

Answer 4

firstly:
add elasticsearch-2.3.3/plugins/delete-by-query/delete-by-query-2.3.3.jar to build path.
then:
Client client = TransportClient.builder().settings(settings)
.addPlugin(DeleteByQueryPlugin.class)
.build()
.addTransportAddress(new InetSocketTransportAddress(
InetAddress.getByName("192.168.0.224"), 9300));