317 lines
12 KiB
Markdown
317 lines
12 KiB
Markdown
---
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layout: default
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title: Java client
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nav_order: 30
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---
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# Java client
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The OpenSearch Java client allows you to interact with your OpenSearch clusters through Java methods and data structures rather than HTTP methods and raw JSON. For example, you can submit requests to your cluster using objects to create indexes, add data to documents, or complete some other operation using the client's built-in methods. For the client's complete API documentation and additional examples, see the [javadoc](https://www.javadoc.io/doc/org.opensearch.client/opensearch-java/latest/index.html).
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This getting started guide illustrates how to connect to OpenSearch, index documents, and run queries. For the client source code, see the [opensearch-java repo](https://github.com/opensearch-project/opensearch-java).
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## Installing the client
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To start using the OpenSearch Java client, ensure that you have the following dependencies in your project's `pom.xml` file:
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```xml
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<dependency>
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<groupId>org.opensearch.client</groupId>
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<artifactId>opensearch-rest-client</artifactId>
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<version>{{site.opensearch_version}}</version>
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</dependency>
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<dependency>
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<groupId>org.opensearch.client</groupId>
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<artifactId>opensearch-java</artifactId>
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<version>2.0.0</version>
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</dependency>
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```
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{% include copy.html %}
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If you're using Gradle, add the following dependencies to your project.
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```
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dependencies {
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implementation 'org.opensearch.client:opensearch-rest-client: {{site.opensearch_version}}'
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implementation 'org.opensearch.client:opensearch-java:2.0.0'
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}
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```
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{% include copy.html %}
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You can now start your OpenSearch cluster.
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## Security
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Before using the REST client in your Java application, you must configure the application's truststore to connect to the security plugin. If you are using self-signed certificates or demo configurations, you can use the following command to create a custom truststore and add in root authority certificates.
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If you're using certificates from a trusted Certificate Authority (CA), you don't need to configure the truststore.
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```bash
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keytool -import <path-to-cert> -alias <alias-to-call-cert> -keystore <truststore-name>
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```
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{% include copy.html %}
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You can now point your Java client to the truststore and set basic authentication credentials that can access a secure cluster (refer to the sample code below on how to do so).
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If you run into issues when configuring security, see [common issues]({{site.url}}{{site.baseurl}}/troubleshoot/index) and [troubleshoot TLS]({{site.url}}{{site.baseurl}}/troubleshoot/tls).
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## Sample data
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This section uses a class called `IndexData`, which is a simple Java class that stores basic data and methods. For your own OpenSearch cluster, you might find that you need a more robust class to store your data.
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### IndexData class
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```java
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static class IndexData {
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private String firstName;
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private String lastName;
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public IndexData(String firstName, String lastName) {
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this.firstName = firstName;
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this.lastName = lastName;
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}
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public String getFirstName() {
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return firstName;
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}
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public void setFirstName(String firstName) {
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this.firstName = firstName;
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}
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public String getLastName() {
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return lastName;
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}
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public void setLastName(String lastName) {
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this.lastName = lastName;
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}
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@Override
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public String toString() {
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return String.format("IndexData{first name='%s', last name='%s'}", firstName, lastName);
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}
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}
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```
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{% include copy.html %}
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## Initializing the client with SSL and TLS enabled
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This code example uses basic credentials that come with the default OpenSearch configuration. If you’re using the Java client with your own OpenSearch cluster, be sure to change the code so that it uses your own credentials.
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The following sample code initializes a client with SSL and TLS enabled:
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```java
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import org.apache.http.HttpHost;
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import org.apache.http.auth.AuthScope;
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import org.apache.http.auth.UsernamePasswordCredentials;
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import org.apache.http.client.CredentialsProvider;
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import org.apache.http.impl.client.BasicCredentialsProvider;
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import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
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import org.opensearch.client.RestClient;
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import org.opensearch.client.RestClientBuilder;
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import org.opensearch.client.base.RestClientTransport;
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import org.opensearch.client.base.Transport;
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import org.opensearch.client.json.jackson.JacksonJsonpMapper;
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import org.opensearch.client.opensearch.OpenSearchClient;
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import org.opensearch.client.opensearch._global.IndexRequest;
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import org.opensearch.client.opensearch._global.IndexResponse;
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import org.opensearch.client.opensearch._global.SearchResponse;
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import org.opensearch.client.opensearch.indices.*;
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import org.opensearch.client.opensearch.indices.put_settings.IndexSettingsBody;
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import java.io.IOException;
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public class OpenSearchClientExample {
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public static void main(String[] args) {
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RestClient restClient = null;
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try{
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System.setProperty("javax.net.ssl.trustStore", "/full/path/to/keystore");
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System.setProperty("javax.net.ssl.trustStorePassword", "password-to-keystore");
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//Only for demo purposes. Don't specify your credentials in code.
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final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
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credentialsProvider.setCredentials(AuthScope.ANY,
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new UsernamePasswordCredentials("admin", "admin"));
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//Initialize the client with SSL and TLS enabled
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restClient = RestClient.builder(new HttpHost("localhost", 9200, "https")).
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setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {
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@Override
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public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
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return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
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}
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}).build();
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Transport transport = new RestClientTransport(restClient, new JacksonJsonpMapper());
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OpenSearchClient client = new OpenSearchClient(transport);
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}
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}
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}
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```
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{% include copy.html %}
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## Creating an index
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You can create an index with non-default settings using the following code:
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```java
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String index = "sample-index";
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CreateRequest createIndexRequest = new CreateRequest.Builder().index(index).build();
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client.indices().create(createIndexRequest);
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IndexSettings indexSettings = new IndexSettings.Builder().autoExpandReplicas("0-all").build();
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IndexSettingsBody settingsBody = new IndexSettingsBody.Builder().settings(indexSettings).build();
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PutSettingsRequest putSettingsRequest = new PutSettingsRequest.Builder().index(index).value(settingsBody).build();
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client.indices().putSettings(putSettingsRequest);
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```
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{% include copy.html %}
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## Indexing data
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You can index data into OpenSearch using the following code:
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```java
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IndexData indexData = new IndexData("first_name", "Bruce");
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IndexRequest<IndexData> indexRequest = new IndexRequest.Builder<IndexData>().index(index).id("1").document(indexData).build();
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client.index(indexRequest);
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```
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{% include copy.html %}
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## Searching for documents
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You can search for a document using the following code:
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```java
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SearchResponse<IndexData> searchResponse = client.search(s -> s.index(index), IndexData.class);
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for (int i = 0; i< searchResponse.hits().hits().size(); i++) {
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System.out.println(searchResponse.hits().hits().get(i).source());
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}
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```
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{% include copy.html %}
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## Deleting a document
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The following sample code deletes a document whose ID is 1:
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```java
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client.delete(b -> b.index(index).id("1"));
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```
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{% include copy.html %}
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### Deleting an index
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The following sample code deletes an index:
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```java
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DeleteRequest deleteRequest = new DeleteRequest.Builder().index(index).build();
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DeleteResponse deleteResponse = client.indices().delete(deleteRequest);
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} catch (IOException e){
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System.out.println(e.toString());
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} finally {
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try {
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if (restClient != null) {
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restClient.close();
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}
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} catch (IOException e) {
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System.out.println(e.toString());
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}
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}
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}
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}
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```
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{% include copy.html %}
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## Sample program
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The following sample program creates a client, adds an index with non-default settings, inserts a document, searches for the document, deletes the document, and then deletes the index:
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```java
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import org.apache.http.HttpHost;
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import org.apache.http.auth.AuthScope;
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import org.apache.http.auth.UsernamePasswordCredentials;
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import org.apache.http.client.CredentialsProvider;
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import org.apache.http.impl.client.BasicCredentialsProvider;
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import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
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import org.opensearch.client.RestClient;
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import org.opensearch.client.RestClientBuilder;
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import org.opensearch.client.base.RestClientTransport;
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import org.opensearch.client.base.Transport;
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import org.opensearch.client.json.jackson.JacksonJsonpMapper;
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import org.opensearch.client.opensearch.OpenSearchClient;
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import org.opensearch.client.opensearch._global.IndexRequest;
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import org.opensearch.client.opensearch._global.IndexResponse;
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import org.opensearch.client.opensearch._global.SearchResponse;
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import org.opensearch.client.opensearch.indices.*;
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import org.opensearch.client.opensearch.indices.put_settings.IndexSettingsBody;
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import java.io.IOException;
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public class OpenSearchClientExample {
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public static void main(String[] args) {
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RestClient restClient = null;
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try{
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System.setProperty("javax.net.ssl.trustStore", "/full/path/to/keystore");
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System.setProperty("javax.net.ssl.trustStorePassword", "password-to-keystore");
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//Only for demo purposes. Don't specify your credentials in code.
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final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
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credentialsProvider.setCredentials(AuthScope.ANY,
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new UsernamePasswordCredentials("admin", "admin"));
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//Initialize the client with SSL and TLS enabled
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restClient = RestClient.builder(new HttpHost("localhost", 9200, "https")).
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setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {
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@Override
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public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
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return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
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}
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}).build();
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Transport transport = new RestClientTransport(restClient, new JacksonJsonpMapper());
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OpenSearchClient client = new OpenSearchClient(transport);
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//Create the index
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String index = "sample-index";
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CreateRequest createIndexRequest = new CreateRequest.Builder().index(index).build();
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client.indices().create(createIndexRequest);
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//Add some settings to the index
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IndexSettings indexSettings = new IndexSettings.Builder().autoExpandReplicas("0-all").build();
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IndexSettingsBody settingsBody = new IndexSettingsBody.Builder().settings(indexSettings).build();
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PutSettingsRequest putSettingsRequest = new PutSettingsRequest.Builder().index(index).value(settingsBody).build();
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client.indices().putSettings(putSettingsRequest);
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//Index some data
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IndexData indexData = new IndexData("first_name", "Bruce");
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IndexRequest<IndexData> indexRequest = new IndexRequest.Builder<IndexData>().index(index).id("1").document(indexData).build();
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client.index(indexRequest);
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//Search for the document
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SearchResponse<IndexData> searchResponse = client.search(s -> s.index(index), IndexData.class);
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for (int i = 0; i< searchResponse.hits().hits().size(); i++) {
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System.out.println(searchResponse.hits().hits().get(i).source());
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}
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//Delete the document
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client.delete(b -> b.index(index).id("1"));
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// Delete the index
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DeleteRequest deleteRequest = new DeleteRequest.Builder().index(index).build();
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DeleteResponse deleteResponse = client.indices().delete(deleteRequest);
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} catch (IOException e){
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System.out.println(e.toString());
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} finally {
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try {
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if (restClient != null) {
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restClient.close();
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}
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} catch (IOException e) {
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System.out.println(e.toString());
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}
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}
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}
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}
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```
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{% include copy.html %}
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