从 Java 添加映射到类型 - 我该怎么做? [英] Adding mapping to a type from Java - how do I do it?

问题描述

我正在尝试或多或少地使用 Java API 重新创建这个示例.

I am trying to recreate this example using the Java API more or less.

我认为我需要的只是向索引添加映射，但是 Java API 文档并不清楚如何执行此操作.

I think all I need is to add a mapping to the index, but the Java API docs are not exactly clear on how to do this.

请告诉我如何在 Java 中创建一个映射，它是 相当于文档中的示例 :

Please tell me how I create a mapping in Java that is the equivalent of this from the example in the documentation :

curl -X PUT localhost:9200/test/tweet/_mapping -d '{
    "tweet" : {
        "_ttl" : { "enabled" : true, "default" : "1d" }
    }
}'

这是我的代码:

package foo;

import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;

import java.io.IOException;

import org.elasticsearch.action.admin.indices.create.CreateIndexRequestBuilder;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequestBuilder;
import org.elasticsearch.action.admin.indices.exists.indices.IndicesExistsResponse;
import org.elasticsearch.action.get.GetRequestBuilder;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexRequestBuilder;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.common.xcontent.XContentBuilder;

public class MyTestClass {

    private static Client getClient() {
        ImmutableSettings.Builder settings = ImmutableSettings.settingsBuilder();
        TransportClient transportClient = new TransportClient(settings);
        transportClient = transportClient.addTransportAddress(new InetSocketTransportAddress("localhost", 9300));
        return (Client) transportClient;
    }

    public static void main(String[] args) throws IOException, InterruptedException {

        final Client client = getClient();
        // Create Index and set settings and mappings
        final String indexName = "test";
        final String documentType = "tweet";
        final String documentId = "1";
        final String fieldName = "foo";
        final String value = "bar";

        IndicesExistsResponse res =  client.admin().indices().prepareExists(indexName).execute().actionGet();
        if (res.isExists()) {
            DeleteIndexRequestBuilder delIdx = client.admin().indices().prepareDelete(indexName);
            delIdx.execute().actionGet();
        }

        CreateIndexRequestBuilder createIndexRequestBuilder = client.admin().indices().prepareCreate(indexName);

        // MAPPING GOES HERE

//      createIndexRequestBuilder.addMapping(documentType, WHATEVER THE MAPPING IS);

        // MAPPING DONE
        createIndexRequestBuilder.execute().actionGet();

        // Add documents
        IndexRequestBuilder indexRequestBuilder = client.prepareIndex(indexName, documentType, documentId);
        // build json object
        XContentBuilder contentBuilder = jsonBuilder().startObject().prettyPrint();
        contentBuilder.field(fieldName, value);

        indexRequestBuilder.setSource(contentBuilder);
        indexRequestBuilder.execute().actionGet();

        // Get document
        System.out.println(getValue(client, indexName, documentType, documentId, fieldName));

        Thread.sleep(10000L);

        // Try again
        System.out.println(getValue(client, indexName, documentType, documentId, fieldName));
    }

    protected static String getValue(final Client client, final String indexName, final String documentType,
            final String documentId, final String fieldName) {
        GetRequestBuilder getRequestBuilder = client.prepareGet(indexName, documentType, documentId);
        getRequestBuilder.setFields(new String[] { fieldName });
        GetResponse response2 = getRequestBuilder.execute().actionGet();
        String name = response2.getField(fieldName).getValue().toString();
        return name;
    }

}

推荐答案

最后一天的谷歌搜索得到了回报.坦率地说，elasticsearch 的 Java API 文档可以使用一些端到端示例，更不用说 JavaDoc...

Finally a day of googling paid off. Frankly the Java API docs for elasticsearch could use some end-to-end examples, not to mention JavaDoc...

这是一个运行示例.你必须有一个在本地主机上运行的节点才能工作！

Here's a running example. You must have a node running on localhost for this to work!

package foo;

import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;

import java.io.IOException;

import org.elasticsearch.action.admin.indices.create.CreateIndexRequestBuilder;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequestBuilder;
import org.elasticsearch.action.admin.indices.exists.indices.IndicesExistsResponse;
import org.elasticsearch.action.get.GetRequestBuilder;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexRequestBuilder;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.common.xcontent.XContentBuilder;

public class MyTestClass {

    private static final String ID_NOT_FOUND = "<ID NOT FOUND>";

    private static Client getClient() {
        final ImmutableSettings.Builder settings = ImmutableSettings.settingsBuilder();
        TransportClient transportClient = new TransportClient(settings);
        transportClient = transportClient.addTransportAddress(new InetSocketTransportAddress("localhost", 9300));
        return transportClient;
    }

    public static void main(final String[] args) throws IOException, InterruptedException {

        final Client client = getClient();
        // Create Index and set settings and mappings
        final String indexName = "test";
        final String documentType = "tweet";
        final String documentId = "1";
        final String fieldName = "foo";
        final String value = "bar";

        final IndicesExistsResponse res = client.admin().indices().prepareExists(indexName).execute().actionGet();
        if (res.isExists()) {
            final DeleteIndexRequestBuilder delIdx = client.admin().indices().prepareDelete(indexName);
            delIdx.execute().actionGet();
        }

        final CreateIndexRequestBuilder createIndexRequestBuilder = client.admin().indices().prepareCreate(indexName);

        // MAPPING GOES HERE

        final XContentBuilder mappingBuilder = jsonBuilder().startObject().startObject(documentType)
                .startObject("_ttl").field("enabled", "true").field("default", "1s").endObject().endObject()
                .endObject();
        System.out.println(mappingBuilder.string());
        createIndexRequestBuilder.addMapping(documentType, mappingBuilder);

        // MAPPING DONE
        createIndexRequestBuilder.execute().actionGet();

        // Add documents
        final IndexRequestBuilder indexRequestBuilder = client.prepareIndex(indexName, documentType, documentId);
        // build json object
        final XContentBuilder contentBuilder = jsonBuilder().startObject().prettyPrint();
        contentBuilder.field(fieldName, value);

        indexRequestBuilder.setSource(contentBuilder);
        indexRequestBuilder.execute().actionGet();

        // Get document
        System.out.println(getValue(client, indexName, documentType, documentId, fieldName));

        int idx = 0;
        while (true) {
            Thread.sleep(10000L);
            idx++;
            System.out.println(idx * 10 + " seconds passed");
            final String name = getValue(client, indexName, documentType, documentId, fieldName);
            if (ID_NOT_FOUND.equals(name)) {
                break;
            } else {
                // Try again
                System.out.println(name);
            }
        }
        System.out.println("Document was garbage collected");
    }

    protected static String getValue(final Client client, final String indexName, final String documentType,
            final String documentId, final String fieldName) {
        final GetRequestBuilder getRequestBuilder = client.prepareGet(indexName, documentType, documentId);
        getRequestBuilder.setFields(new String[] { fieldName });
        final GetResponse response2 = getRequestBuilder.execute().actionGet();
        if (response2.isExists()) {
            final String name = response2.getField(fieldName).getValue().toString();
            return name;
        } else {
            return ID_NOT_FOUND;
        }
    }

}

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