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# Elastic
Elastic is an [Elasticsearch](http://www.elasticsearch.org/) client for the
[Go](http://www.golang.org/) programming language.
[![Build Status](https://travis-ci.org/olivere/elastic.svg?branch=master)](https://travis-ci.org/olivere/elastic)
[![Godoc](http://img.shields.io/badge/godoc-reference-blue.svg?style=flat)](https://godoc.org/github.com/olivere/elastic)
[![license](http://img.shields.io/badge/license-MIT-red.svg?style=flat)](https://raw.githubusercontent.com/olivere/elastic/master/LICENSE)
See the [wiki](https://github.com/olivere/elastic/wiki) for additional information about Elastic.
## Releases
**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](https://gopkg.in).**
Here's the version matrix:
Elasticsearch version | Elastic version -| Package URL
----------------------|------------------|------------
2.x | 3.0 **beta** | [`gopkg.in/olivere/elastic.v3-unstable`](https://gopkg.in/olivere/elastic.v3-unstable) ([source](https://github.com/olivere/elastic/tree/release-branch.v3) [doc](http://godoc.org/gopkg.in/olivere/elastic.v3-unstable))
1.x | 2.0 | [`gopkg.in/olivere/elastic.v2`](https://gopkg.in/olivere/elastic.v2) ([source](https://github.com/olivere/elastic/tree/release-branch.v2) [doc](http://godoc.org/gopkg.in/olivere/elastic.v2))
0.9-1.3 | 1.0 | [`gopkg.in/olivere/elastic.v1`](https://gopkg.in/olivere/elastic.v1) ([source](https://github.com/olivere/elastic/tree/release-branch.v1) [doc](http://godoc.org/gopkg.in/olivere/elastic.v1))
**Example:**
You have Elasticsearch 1.6.0 installed and want to use Elastic. As listed above, you should use Elastic 2.0. So you first install Elastic 2.0.
```sh
$ go get gopkg.in/olivere/elastic.v2
```
Then you use it via the following import path:
```go
import "gopkg.in/olivere/elastic.v2"
```
### Elastic 3.0
Elastic 3.0 targets Elasticsearch 2.x and is currently under [active development](https://github.com/olivere/elastic/tree/release-branch.v3). It is not published to gokpg yet.
There are a lot of [breaking changes in Elasticsearch 2.0](https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking-changes-2.0.html) and we will use this as an opportunity to [clean up and refactor Elastic as well](https://github.com/olivere/elastic/blob/release-branch.v3/CHANGELOG-3.0.md).
### Elastic 2.0
Elastic 2.0 targets Elasticsearch 1.x and published via [`gopkg.in/olivere/elastic.v2`](https://gopkg.in/olivere/elastic.v2).
### Elastic 1.0
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.
## Status
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, 1.1, 1.2, 1.3, 1.4, and 1.5.
Furthermore, we use [Travis CI](https://travis-ci.org/)
to test Elastic with the most recent versions of Elasticsearch and Go.
See the [.travis.yml](https://github.com/olivere/elastic/blob/master/.travis.yml)
file for the exact matrix and [Travis](https://travis-ci.org/olivere/elastic)
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.
## Usage
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.
```go
// Create a client
client, err := elastic.NewClient()
if err != nil {
// Handle error
}
// Create an index
_, err = client.CreateIndex("twitter").Do()
if err != nil {
// Handle error
panic(err)
}
// Add a document to the index
tweet := Tweet{User: "olivere", Message: "Take Five"}
_, err = client.Index().
Index("twitter").
Type("tweet").
Id("1").
BodyJson(tweet).
Do()
if err != nil {
// Handle error
panic(err)
}
// Search with a term query
termQuery := elastic.NewTermQuery("user", "olivere")
searchResult, 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
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)
// Each is a convenience function that iterates over hits in a search result.
// It makes sure you don't need to check for nil values in the response.
// However, it ignores errors in serialization. If you want full control
// over iterating the hits, see below.
var ttyp Tweet
for _, item := range searchResult.Each(reflect.TypeOf(ttyp)) {
if t, ok := item.(Tweet); ok {
fmt.Printf("Tweet by %s: %s\n", t.User, t.Message)
}
}
// TotalHits is another convenience function that works even when something goes wrong.
fmt.Printf("Found a total of %d tweets\n", searchResult.TotalHits())
// Here's how you iterate through results with full control over each step.
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 the index again
_, err = client.DeleteIndex("twitter").Do()
if err != nil {
// Handle error
panic(err)
}
```
See the [wiki](https://github.com/olivere/elastic/wiki) for more details.
## API Status
Here's the current API status.
### APIs
- [x] Search (most queries, filters, facets, aggregations etc. are implemented: see below)
- [x] Index
- [x] Get
- [x] Delete
- [x] Delete By Query
- [x] Update
- [x] Multi Get
- [x] Bulk
- [ ] Bulk UDP
- [ ] Term vectors
- [ ] Multi term vectors
- [x] Count
- [ ] Validate
- [x] Explain
- [x] Search
- [ ] Search shards
- [x] Search template
- [x] Facets (most are implemented, see below)
- [x] Aggregates (most are implemented, see below)
- [x] Multi Search
- [x] Percolate
- [ ] More like this
- [ ] Benchmark
### Indices
- [x] Create index
- [x] Delete index
- [x] Get index
- [x] Indices exists
- [x] Open/close index
- [x] Put mapping
- [x] Get mapping
- [ ] Get field mapping
- [x] Types exist
- [x] Delete mapping
- [x] Index aliases
- [ ] Update indices settings
- [x] Get settings
- [ ] Analyze
- [x] Index templates
- [ ] Warmers
- [ ] Status
- [x] Indices stats
- [ ] Indices segments
- [ ] Indices recovery
- [ ] Clear cache
- [x] Flush
- [x] Refresh
- [x] Optimize
- [ ] Upgrade
### Snapshot and Restore
- [ ] Snapshot
- [ ] Restore
- [ ] Snapshot status
- [ ] Monitoring snapshot/restore progress
- [ ] Partial restore
### Cat APIs
Not implemented. Those are better suited for operating with Elasticsearch
on the command line.
### Cluster
- [x] Health
- [x] State
- [x] Stats
- [ ] Pending cluster tasks
- [ ] Cluster reroute
- [ ] Cluster update settings
- [ ] Nodes stats
- [x] Nodes info
- [ ] Nodes hot_threads
- [ ] Nodes shutdown
### Search
- [x] Inner hits (for ES >= 1.5.0; see [docs](www.elastic.co/guide/en/elasticsearch/reference/1.5/search-request-inner-hits.html))
### Query DSL
#### Queries
- [x] `match`
- [x] `multi_match`
- [x] `bool`
- [x] `boosting`
- [ ] `common_terms`
- [ ] `constant_score`
- [x] `dis_max`
- [x] `filtered`
- [x] `fuzzy_like_this_query` (`flt`)
- [x] `fuzzy_like_this_field_query` (`flt_field`)
- [x] `function_score`
- [x] `fuzzy`
- [ ] `geo_shape`
- [x] `has_child`
- [x] `has_parent`
- [x] `ids`
- [ ] `indices`
- [x] `match_all`
- [x] `mlt`
- [x] `mlt_field`
- [x] `nested`
- [x] `prefix`
- [x] `query_string`
- [x] `simple_query_string`
- [x] `range`
- [x] `regexp`
- [ ] `span_first`
- [ ] `span_multi_term`
- [ ] `span_near`
- [ ] `span_not`
- [ ] `span_or`
- [ ] `span_term`
- [x] `term`
- [x] `terms`
- [ ] `top_children`
- [x] `wildcard`
- [x] `minimum_should_match`
- [ ] `multi_term_query_rewrite`
- [x] `template_query`
#### Filters
- [x] `and`
- [x] `bool`
- [x] `exists`
- [ ] `geo_bounding_box`
- [x] `geo_distance`
- [ ] `geo_distance_range`
- [x] `geo_polygon`
- [ ] `geoshape`
- [ ] `geohash`
- [x] `has_child`
- [x] `has_parent`
- [x] `ids`
- [ ] `indices`
- [x] `limit`
- [x] `match_all`
- [x] `missing`
- [x] `nested`
- [x] `not`
- [x] `or`
- [x] `prefix`
- [x] `query`
- [x] `range`
- [x] `regexp`
- [ ] `script`
- [x] `term`
- [x] `terms`
- [x] `type`
### Facets
- [x] Terms
- [x] Range
- [x] Histogram
- [x] Date Histogram
- [x] Filter
- [x] Query
- [x] Statistical
- [x] Terms Stats
- [x] Geo Distance
### Aggregations
- [x] min
- [x] max
- [x] sum
- [x] avg
- [x] stats
- [x] extended stats
- [x] value count
- [x] percentiles
- [x] percentile ranks
- [x] cardinality
- [x] geo bounds
- [x] top hits
- [ ] scripted metric
- [x] global
- [x] filter
- [x] filters
- [x] missing
- [x] nested
- [x] reverse nested
- [x] children
- [x] terms
- [x] significant terms
- [x] range
- [x] date range
- [x] ipv4 range
- [x] histogram
- [x] date histogram
- [x] geo distance
- [x] geohash grid
### Sorting
- [x] Sort by score
- [x] Sort by field
- [x] Sort by geo distance
- [x] Sort by script
### Scan
Scrolling through documents (e.g. `search_type=scan`) are implemented via
the `Scroll` and `Scan` services. The `ClearScroll` API is implemented as well.
## How to contribute
Read [the contribution guidelines](https://github.com/olivere/elastic/blob/master/CONTRIBUTING.md).
## Credits
Thanks a lot for the great folks working hard on
[Elasticsearch](http://www.elasticsearch.org/)
and
[Go](http://www.golang.org/).
## LICENSE
MIT-LICENSE. See [LICENSE](http://olivere.mit-license.org/)
or the LICENSE file provided in the repository for details.
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