elasticsearch API

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elasticsearch

3.1 集群的连接

3.1.1 作为Elasticsearch节点

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import static org.elasticsearch.node.NodeBuilder.nodeBuilder;
import org.elasticsearch.client.Client;
import org.elasticsearch.node.Node;

Node node = nodeBuilder().clusterName("escluster2").client(true).
node();
Client client = node.client();
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3.1.2 使用Transport连接

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import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;

Settings settings = ImmutableSettings.settingsBuilder().put("cluster.name", "escluster2").build();
TransportClient client = new TransportClient(settings);
client.addTransportAddress(new InetSocketTransportAddress("127.0.0.1",9300));
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3.2 文档的CRUD

3.2.1 查询文档

GetResponse response = client.prepareGet("library", "book", "1")
.setFields("title", "_source")
.execute().actionGet();

3.2.2 索引文档

import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.client.Client;

IndexResponse response = client.prepareIndex("library", "book", "2")
.setSource("{ \"title\": \"Mastering ElasticSearch\"}")
.execute().actionGet();

3.2.3 更新文档

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import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.Client;
import java.util.Map;
import org.elasticsearch.common.collect.Maps;

Map<String, Object> params = Maps.newHashMap();
params.put("ntitle", "ElasticSearch Server Book");
UpdateResponse response = client.prepareUpdate("library", "book", "2")
.setScript("ctx._source.title = ntitle")
.setScriptParams(params)
.execute().actionGet();
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3.2.4 删除文档

import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.client.Client;

DeleteResponse response = client.prepareDelete("library", "book", "2")
.execute().actionGet();

3.3 Elasticsearch检索

3.3.1 Preparing a query

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import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.Client;
import org.elasticsearch.search.SearchHit;

SearchResponse response = client.prepareSearch("library")
.addFields("title", "_source")
.execute().actionGet();
for(SearchHit hit: response.getHits().getHits()) {
 System.out.println(hit.getId());
 if (hit.getFields().containsKey("title")) {
 System.out.println("field.title: "+ hit.getFields().get("title").getValue());
 }
 System.out.println("source.title: " + hit.getSource().get("title"));
}
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3.3.2 Building queries

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import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;

QueryBuilder queryBuilder = QueryBuilders
.disMaxQuery()
.add(QueryBuilders.termQuery("title", "Elastic"))
.add(QueryBuilders.prefixQuery("title", "el"));
System.out.println(queryBuilder.toString());
SearchResponse response = client.prepareSearch("library")
.setQuery(queryBuilder)
.execute().actionGet();
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3.3.3 Using the match all documents query

queryBuilder = QueryBuilders.matchAllQuery()
.boost(11f).normsField("title");

3.3.4 The match query

queryBuilder = QueryBuilders
.matchQuery("message", "a quick brown fox")
.operator(Operator.AND)
.zeroTermsQuery(ZeroTermsQuery.ALL);

3.3.5 Using the geo shape query

queryBuilder = QueryBuilders.geoShapeQuery("location",
ShapeBuilder.newRectangle()
.topLeft(13, 53)
.bottomRight(14, 52)
.build());

3.3.6 Paging query

SearchResponse response = client.prepareSearch("library")
.setQuery(QueryBuilders.matchAllQuery())
.setFrom(10)
.setSize(20)
.execute().actionGet();

3.3.7 Sorting

SearchResponse response = client.prepareSearch("library")
.setQuery(QueryBuilders.matchAllQuery())
.addSort(SortBuilders.fieldSort("title"))
.addSort("_score", SortOrder.DESC)
.execute().actionGet()

3.3.8 Filtering

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FilterBuilder filterBuilder = FilterBuilders
.andFilter(
FilterBuilders.existsFilter("title").filterName("exist"),
FilterBuilders.termFilter("title", "elastic")
);
SearchResponse response = client.prepareSearch("library")
.setFilter(filterBuilder)
.execute().actionGet();
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3.3.9 Faceting

FacetBuilder facetBuilder = FacetBuilders
.filterFacet("test")
.filter(FilterBuilders.termFilter("title", "elastic"));
SearchResponse response = client.prepareSearch("library")
.addFacet(facetBuilder)
.execute().actionGet();

3.3.10 Highlighting

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SearchResponse response = client.prepareSearch("wikipedia")
.addHighlightedField("title")
.setQuery(QueryBuilders.termQuery("title", "actress"))
.setHighlighterPreTags("<1>", "<2>")
.setHighlighterPostTags("</1>", "</2>")
.execute().actionGet();
for(SearchHit hit: response.getHits().getHits()) {
 HighlightField hField = hit.getHighlightFields().get("title");
 for (Text t : hField.fragments()) {
 System.out.println(t.string());
 }
}
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3.3.11 Suggestions

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SearchResponse response = client.prepareSearch("wikipedia")
.setQuery(QueryBuilders.matchAllQuery())
.addSuggestion(new TermSuggestionBuilder("first_suggestion")
.text("graphics designer")
.field("_all"))
.execute().actionGet();

for( Entry<? extends Option> entry : response.getSuggest().getSuggestion("first_suggestion").getEntries()) {
 System.out.println("Check for: " + entry.getText() + ". Options:");
 for( Option option : entry.getOptions()) {
 System.out.println("\t" + option.getText());
 }
}
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3.3.12 Counting

CountResponse response = client.prepareCount("library")
.setQuery(QueryBuilders.termQuery("title", "elastic"))
.execute().actionGet();

3.3.13 Scrolling

SearchResponse responseSearch = client.prepareSearch("library")
.setScroll("1m")
.setSearchType(SearchType.SCAN)
.execute().actionGet();
String scrollId = responseSearch.getScrollId();
SearchResponse response = client.prepareSearchScroll(scrollId).execute().actionGet();

3.3.14 Bulk

BulkResponse response = client.prepareBulk()
.add(client.prepareIndex("library", "book", "5")
.setSource("{ \"title\" : \"Solr Cookbook\"}")
.request())
.add(client.prepareDelete("library", "book", "2").request()).execute().actionGet();

3.3.15 The delete by query

DeleteByQueryResponse response = client.prepareDeleteByQuery("library")
.setQuery(QueryBuilders.termQuery("title", "ElasticSearch"))
.execute().actionGet();

3.3.16 Multi GET

MultiGetResponse response = client.prepareMultiGet()
.add("library", "book", "1", "2")
.execute().actionGet();

3.3.16 Multi Search

MultiSearchResponse response = client.prepareMultiSearch()
.add(client.prepareSearch("library", "book").request())
.add(client.prepareSearch("news").
.setFilter(FilterBuilders.termFilter("tags", "important")))
.execute().actionGet();

3.3.17 Building JSON queries and documents

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IndexResponse response = client
.prepareIndex("library", "book", "2")
.setSource("{ \"title\": \"Mastering ElasticSearch\"}")
.execute().actionGet();

Map<String, Object> m = Maps.newHashMap();
m.put("1", "Introduction");
m.put("2", "Basics");
m.put("3", "And the rest");
XContentBuilder json = XContentFactory.jsonBuilder().prettyPrint()
.startObject()
.field("id").value("2123")
.field("lastCommentTime", new Date())
.nullField("published")
.field("chapters").map(m)
.field("title", "Mastering ElasticSearch")
.array("tags", "search", "ElasticSearch", "nosql")
.field("values")
.startArray()
.value(1)
.value(10)
.endArray()
.endObject();
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3.4 The administration API

3.4.1 The cluster administration API

3.4.1.1 The cluster and indices health API

ClusterHealthResponse response = client.admin().cluster()
.prepareHealth("library")
.execute().actionGet();

3.4.1.2 The cluster state API

ClusterStateResponse response = client.admin().cluster()
.prepareState()
.execute().actionGet();

3.4.1.3 The update settings API

Map<String, Object> map = Maps.newHashMap();
map.put("indices.ttl.interval", "10m");
ClusterUpdateSettingsResponse response = client.admin().cluster()
.prepareUpdateSettings()
.setTransientSettings(map)
.execute().actionGet();

3.4.1.4 The reroute API

ClusterRerouteResponse response = client.admin().cluster()
.prepareReroute()
.setDryRun(true)
.add(new MoveAllocationCommand(new ShardId("library", 3), "G3czOt4HQbKZT1RhpPCULw",PvHtEMuRSJ6rLJ27AW3U6w"),
 new CancelAllocationCommand(new ShardId("library", 2), "G3czOt4HQbKZT1RhpPCULw",rue))
.execute().actionGet();

3.4.1.5 The nodes information API

NodesInfoResponse response = client.admin().cluster()
.prepareNodesInfo()
.setNetwork(true)
.setPlugin(true)
.execute().actionGet();

3.4.1.6 The node statistics API

NodesStatsResponse response = client.admin().cluster()
.prepareNodesStats()
.all()
.execute().actionGet();

3.4.1.7 The nodes hot threads API

NodesHotThreadsResponse response = client.admin().cluster()
.prepareNodesHotThreads()
.execute().actionGet();

3.4.1.8 The nodes shutdown API

NodesShutdownResponse response = client.admin().cluster()
.prepareNodesShutdown()
.execute().actionGet();

3.4.1.9 The search shards API

ClusterSearchShardsResponse response = client.admin().cluster()
.prepareSearchShards()
.setIndices("library")
.setRouting("12")
.execute().actionGet();

3.4.2 The Indices administration API

3.4.2.1 The index existence API

IndicesExistsResponse response = client.admin().indices()
.prepareExists("books", "library")
.execute().actionGet();

3.4.2.2 The Type existence API

TypesExistsResponse response = client.admin().indices()
.prepareTypesExists("library")
.setTypes("book")
.execute().actionGet();

3.4.2.3 The indices stats API

IndicesStatsResponse response = client.admin().indices()
.prepareStats("library")
.all()
.execute().actionGet();

3.4.2.4 Index status

IndicesStatusResponse response = client.admin().indices()
.prepareStatus("library")
.setRecovery(true)
.setSnapshot(true)
.execute().actionGet();

3.4.2.5 Segments information API

IndicesSegmentResponse response = client.admin().indices()
.prepareSegments("library")
.execute().actionGet();
3.4.2.6 Creating an index API
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CreateIndexResponse response = client.admin().indices()
.prepareCreate("news")
.setSettings(ImmutableSettings.settingsBuilder()
.put("number_of_shards", 1))
.addMapping("news", XContentFactory.jsonBuilder()
.startObject()
.startObject("news")
.startObject("properties")
.startObject("title")
.field("analyzer", "whitespace")
.field("type", "string")
.endObject()
.endObject()
.endObject()
.endObject())
.execute().actionGet();
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3.4.2.7 Deleting an index

DeleteIndexResponse response = client.admin().indices()
.prepareDelete("news")
.execute().actionGet();

3.4.2.8 Closing an index

CloseIndexResponse response = client.admin().indices()
.prepareClose("library")
.execute().actionGet();

3.4.2.9 Opening an index

OpenIndexResponse response = client.admin().indices()
.prepareOpen("library")
.execute().actionGet();

3.4.2.10 The Refresh API

RefreshResponse response = client.admin().indices()
.prepareRefresh("library")
.execute().actionGet();

3.4.2.11 The Flush API

FlushResponse response = client.admin().indices()
.prepareFlush("library")
.setFull(false)
.execute().actionGet();

3.4.2.12 The Optimize API

OptimizeResponse response = client.admin().indices()
.prepareOptimize("library")
.setMaxNumSegments(2)
.setFlush(true)
.setOnlyExpungeDeletes(false)
.execute().actionGet();

3.4.2.13 The put mapping API

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PutMappingResponse response = client.admin().indices()
.preparePutMapping("news")
.setType("news")
.setSource(XContentFactory.jsonBuilder()
.startObject()
.startObject("news")
.startObject("properties")
.startObject("title")
.field("analyzer", "whitespace")
.field("type", "string")
.endObject()
.endObject()
.endObject()
.endObject())
.execute().actionGet();
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3.4.2.14 The delete mapping API

DeleteMappingResponse response = client.admin().indices()
.prepareDeleteMapping("news")
.setType("news")
.execute().actionGet();

3.4.2.15 The gateway snapshot API

GatewaySnapshotResponse response = client.admin().indices()
.prepareGatewaySnapshot("news")
.execute().actionGet();

3.4.2.16 The aliases API

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IndicesAliasesResponse response = client.admin().indices()
.prepareAliases()
.addAlias("news", "n")
.addAlias("library", "elastic_books",
FilterBuilders.termFilter("title", "elasticsearch"))
.removeAlias("news", "current_news")
.execute().actionGet();
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3.4.2.17 The get aliases API

IndicesGetAliasesResponse response = client.admin().indices()
.prepareGetAliases("elastic_books", "n")
.execute().actionGet();

3.4.2.18 The aliases exists API

AliasesExistResponse response = client.admin().indices()
.prepareAliasesExist("elastic*", "unknown")
.execute().actionGet();

3.4.2.19 The clear cache API

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ClearIndicesCacheResponse response = client.admin().indices()
.prepareClearCache("library")
.setFieldDataCache(true)
.setFields("title")
.setFilterCache(true)
.setIdCache(true)
.execute().actionGet();
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3.4.2.20 The update settings API

UpdateSettingsResponse response = client.admin().indices()
.prepareUpdateSettings("library")
.setSettings(ImmutableSettings.builder()
.put("index.number_of_replicas", 2))
.execute().actionGet();

3.4.2.21 The analyze API

AnalyzeResponse response = client.admin().indices()
.prepareAnalyze("library", "ElasticSearch Servers")
.setTokenizer("whitespace")
.setTokenFilters("nGram")
.execute().actionGet();

3.4.2.22 The put template API

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PutIndexTemplateResponse response = client.admin().indices()
.preparePutTemplate("my_template")
.setTemplate("product*")
.setSettings(ImmutableSettings.builder()
.put("index.number_of_replicas", 2)
.put("index.number_of_shards", 1))
.addMapping("item", XContentFactory.jsonBuilder()
.startObject()
.startObject("item")
.startObject("properties")
.startObject("title")
.field("type", "string")
.endObject()
.endObject()
.endObject()
.endObject())
.execute().actionGet();
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3.4.2.23 The delete template API

DeleteIndexTemplateResponse response = client.admin().indices()
.prepareDeleteTemplate("my_*")
.execute().actionGet();

3.4.2.24 The validate query API

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ValidateQueryResponse response = client.admin().indices()
.prepareValidateQuery("library")
.setExplain(true)
.setQuery(XContentFactory.jsonBuilder()
.startObject()
.field("name").value("elastic search")
.endObject().bytes())
.execute().actionGet();
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3.4.2.25 The put warmer API

PutWarmerResponse response = client.admin().indices()
.preparePutWarmer("library_warmer")
.setSearchRequest(client.prepareSearch("library")
.addFacet(FacetBuilders
.termsFacet("tags").field("tags")))
.execute().actionGet();

3.4.2.26 The delete warmer API

DeleteWarmerResponse response = client.admin().indices()
.prepareDeleteWarmer()
.setName("library_*")
.execute().actionGet();

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