从Java向类型添加映射 - 我该怎么做？

终于，一天的谷歌搜索得到了回报。坦率地说，用于elasticsearch的Java API文档可以使用一些端到端的示例，更不用说JavaDoc了。

下面是一个运行示例。您必须在本地主机上运行一个节点才能正常工作！

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;
        }
    }

}

我实际上将在这里添加另一个答案，因为坦率地说，上面的答案为我的实现提供了一个开始，但没有100%回答实际问题（不仅更新根级别属性，而且更新实际字段/属性）。我花了将近2天的时间才弄清楚这一点（对于ES Java API来说，文档有点轻）。我的“映射”类还不是100%，但以后可以添加更多字段（“格式”等）。

我希望这可以帮助其他所有尝试使用更新映射的人！

获取/检索映射

ImmutableOpenMap<String, ImmutableOpenMap<String, MappingMetaData>> indexMappings = response.getMappings();
                    ImmutableOpenMap<String, MappingMetaData> typeMappings = indexMappings.get(indexName);
                    MappingMetaData mapping = typeMappings.get(type);
                    Map<String, Mapping> mappingAsMap = new HashMap<>();
                    try {
                        Object properties = mapping.sourceAsMap().get("properties");
                        mappingAsMap = (Map<String, Mapping>) gson.fromJson(gson.toJson(properties), _elasticsearch_type_mapping_map_type);
                        return mappingAsMap;
                    }

更新映射

PutMappingRequest mappingRequest = new PutMappingRequest(indexName);
            Map<String, Object> properties = new HashMap<>();
            Map<String, Object> mappingsMap = (Map<String, Object>) gson.fromJson(gson.toJson(mapping), Json._obj_map_type);
            properties.put("properties", mappingsMap);
            mappingRequest = mappingRequest.ignoreConflicts(true).type(type).source(properties).actionGet();

我的 GSON 映射类型

public static final Type _obj_map_type = new TypeToken<LinkedHashMap<String, Object>>(){}.getType();
public static final Type _elasticsearch_type_mapping_map_type = new TypeToken<LinkedHashMap<String, Mapping>>(){}.getType();

我的映射类

public class Mapping {

    private String type;
    private String index;
    private String analyzer;

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getIndex() {
        return index;
    }

    public void setIndex(String index) {
        this.index = index;
    }

    public String getAnalyzer() {
        return analyzer;
    }

    public void setAnalyzer(String analyzer) {
        this.analyzer = analyzer;
    }
}