Name: elastic
Owner: CiscoCloud
Description: Elasticsearch client for Go.
Created: 2015-12-09 00:01:33.0
Updated: 2015-12-09 00:01:35.0
Pushed: 2015-12-09 00:04:25.0
Homepage: https://olivere.github.io/elastic/
Size: 1550
Language: Go
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Elastic is an Elasticsearch client for the Go programming language.
See the wiki for additional information about Elastic.
Notice that the master branch always refers to the latest version of Elastic. If you want to use stable versions of Elastic, you should use the packages released via gopkg.in.
Here's the version matrix:
Elasticsearch version | Elastic version -| Package URL
———————-|——————|————
2.x | 3.0 | gopkg.in/olivere/elastic.v3 (source doc)
1.x | 2.0 | gopkg.in/olivere/elastic.v2 (source doc)
0.9-1.3 | 1.0 | gopkg.in/olivere/elastic.v1 (source doc)
Example:
You have Elasticsearch 1.7.3 installed and want to use Elastic. As listed above, you should use Elastic 2.0. So you first install Elastic 2.0.
get gopkg.in/olivere/elastic.v2
Then you use it via the following import path:
rt "gopkg.in/olivere/elastic.v2"
Elastic 3.0 targets Elasticsearch 2.0 and later. Elasticsearch 2.0.0 was released on 28th October 2015.
Notice that there are a lot of breaking changes in Elasticsearch 2.0 and we used this as an opportunity to clean up and refactor Elastic as well.
Elastic 2.0 targets Elasticsearch 1.x and published via gopkg.in/olivere/elastic.v2.
Elastic 1.0 is deprecated. You should really update Elasticsearch and Elastic to a recent version.
However, if you cannot update for some reason, don't worry. Version 1.0 is still available. All you need to do is go-get it and change your import path as described above.
We use Elastic in production since 2012. Although Elastic is quite stable from our experience, we don't have a stable API yet. The reason for this is that Elasticsearch changes quite often and at a fast pace. At this moment we focus on features, not on a stable API.
Having said that, there have been no big API changes that required you to rewrite your application big time. More often than not it's renaming APIs and adding/removing features so that we are in sync with the Elasticsearch API.
Elastic has been used in production with the following Elasticsearch versions: 0.90, 1.0-1.7. Furthermore, we use Travis CI to test Elastic with the most recent versions of Elasticsearch and Go. See the .travis.yml file for the exact matrix and Travis for the results.
Elasticsearch has quite a few features. A lot of them are not yet implemented in Elastic (see below for details). I add features and APIs as required. It's straightforward to implement missing pieces. I'm accepting pull requests :-)
Having said that, I hope you find the project useful.
The first thing you do is to create a Client. The client connects to Elasticsearch on http://127.0.0.1:9200 by default.
You typically create one client for your app. Here's a complete example.
reate a client
nt, err := elastic.NewClient()
rr != nil {
// Handle error
reate an index
rr = client.CreateIndex("twitter").Do()
rr != nil {
// Handle error
panic(err)
dd a document to the index
t := Tweet{User: "olivere", Message: "Take Five"}
rr = client.Index().
Index("twitter").
Type("tweet").
Id("1").
BodyJson(tweet).
Do()
rr != nil {
// Handle error
panic(err)
earch with a term query
Query := elastic.NewTermQuery("user", "olivere")
chResult, err := client.Search().
Index("twitter"). // search in index "twitter"
Query(&termQuery). // specify the query
Sort("user", true). // sort by "user" field, ascending
From(0).Size(10). // take documents 0-9
Pretty(true). // pretty print request and response JSON
Do() // execute
rr != nil {
// Handle error
panic(err)
earchResult is of type SearchResult and returns hits, suggestions,
nd all kinds of other information from Elasticsearch.
Printf("Query took %d milliseconds\n", searchResult.TookInMillis)
ach is a convenience function that iterates over hits in a search result.
t makes sure you don't need to check for nil values in the response.
owever, it ignores errors in serialization. If you want full control
ver iterating the hits, see below.
ttyp Tweet
_, item := range searchResult.Each(reflect.TypeOf(ttyp)) {
if t, ok := item.(Tweet); ok {
fmt.Printf("Tweet by %s: %s\n", t.User, t.Message)
}
otalHits is another convenience function that works even when something goes wrong.
Printf("Found a total of %d tweets\n", searchResult.TotalHits())
ere's how you iterate through results with full control over each step.
earchResult.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)
}
se {
// No hits
fmt.Print("Found no tweets\n")
elete the index again
rr = client.DeleteIndex("twitter").Do()
rr != nil {
// Handle error
panic(err)
See the wiki for more details.
Here's the current API status.
Not implemented. Those are better suited for operating with Elasticsearch on the command line.
matchmulti_matchboolboostingcommon_termsconstant_scoredis_maxfilteredfuzzy_like_this_query (flt)fuzzy_like_this_field_query (flt_field)function_scorefuzzygeo_shapehas_childhas_parentidsindicesmatch_allmltmlt_fieldnestedprefixquery_stringsimple_query_stringrangeregexpspan_firstspan_multi_termspan_nearspan_notspan_orspan_termtermtermstop_childrenwildcardminimum_should_matchmulti_term_query_rewritetemplate_queryandboolexistsgeo_bounding_boxgeo_distancegeo_distance_rangegeo_polygongeoshapegeohashhas_childhas_parentidsindiceslimitmatch_allmissingnestednotorprefixqueryrangeregexpscripttermtermstypeScrolling through documents (e.g. search_type=scan) are implemented via
the Scroll and Scan services. The ClearScroll API is implemented as well.
Read the contribution guidelines.
Thanks a lot for the great folks working hard on Elasticsearch and Go.
MIT-LICENSE. See LICENSE or the LICENSE file provided in the repository for details.