Elasticsearch的一个Google Go客户端：Elastic

jopen 10年前

Elastic是分布式搜索引擎Elasticsearch的一个Google Go客户端。Elastic 在生产环境中测试支持的Elasticsearch版本: 0.90, 1.0, 1.1, 1.2, 和 1.3。

// Import Elastic  import (    "github.com/olivere/elastic"  )    // Obtain a client. You can provide your own HTTP client here.  client, err := elastic.NewClient(http.DefaultClient)  if err != nil {      // Handle error      panic(err)  }    // Use the IndexExists service to check if a specified index exists.  exists, err := client.IndexExists("推ter").Do()  if err != nil {      // Handle error      panic(err)  }  if !exists {      // Create a new index.      createIndex, err := client.CreateIndex("推ter").Do()      if err != nil {          // Handle error          panic(err)      }      if !createIndex.Acknowledged {          // Not acknowledged      }  }    // Index a tweet (using JSON serialization)  tweet1 := Tweet{User: "olivere", Message: "Take Five"}  put1, err := client.Index().      Index("推ter").      Type("tweet").      Id("1").      BodyJson(tweet1).      Do()  if err != nil {      // Handle error      panic(err)  }  fmt.Printf("Indexed tweet %s to index %s, type %s\n", put1.Id, put1.Index, put1.Type)    // Index a second tweet (by string)  tweet2 := `{"user" : "olivere", "message" : "It's a Raggy Waltz"}`  put2, err := client.Index().      Index("推ter").      Type("tweet").      Id("2").      BodyString(tweet2).      Do()  if err != nil {      // Handle error      panic(err)  }  fmt.Printf("Indexed tweet %s to index %s, type %s\n", put2.Id, put2.Index, put2.Type)    // Get tweet with specified ID  get1, err := client.Get().      Index("推ter").      Type("tweet").      Id("1").      Do()  if err != nil {      // Handle error      panic(err)  }  if get1.Found {      fmt.Printf("Got document %s in version %d from index %s, type %s\n", get1.Id, get1.Version, get1.Index, get1.Type)  }    // Flush to make sure the documents got written.  _, err = client.Flush().Index("推ter").Do()  if err != nil {      panic(err)  }    // Search with a term query  termQuery := elastic.NewTermQuery("user", "olivere")  searchResult, err := client.Search().      Index("推ter").   // search in index "推ter"      Query(&termQuery).  // specify the query      Sort("user", true). // sort by "user" field, ascending      From(0).Size(10).   // take documents 0-9      Debug(true).        // print request and response to stdout      Pretty(true).       // pretty print request and response JSON      Do()                // execute  if err != nil {      // Handle error      panic(err)  }    // searchResult is of type SearchResult and returns hits, suggestions,  // and all kinds of other information from Elasticsearch.  fmt.Printf("Query took %d milliseconds\n", searchResult.TookInMillis)    // Number of hits  if searchResult.Hits != nil {      fmt.Printf("Found a total of %d tweets\n", searchResult.Hits.TotalHits)        // Iterate through results      for _, hit := range searchResult.Hits.Hits {          // hit.Index contains the name of the index            // Deserialize hit.Source into a Tweet (could also be just a map[string]interface{}).          var t Tweet          err := json.Unmarshal(*hit.Source, &t)          if err != nil {              // Deserialization failed          }            // Work with tweet          fmt.Printf("Tweet by %s: %s\n", t.User, t.Message)      }  } else {      // No hits      fmt.Print("Found no tweets\n")  }    // ...    // Delete an index.  deleteIndex, err := client.DeleteIndex("推ter").Do()  if err != nil {      // Handle error      panic(err)  }  if !deleteIndex.Acknowledged {      // Not acknowledged  }

API Status

Here's the current API status.

APIs

Indices

Snapshot and Restore

Cat APIs

Not implemented. Those are better suited for operating with Elasticsearch on the command line.

Cluster

Query DSL

Queries

Filters

Facets

Aggregations

项目主页：http://www.open-open.com/lib/view/home/1417077815924