elasticsearch   ![Latest Version] ![Docs] ![Apache-2 licensed]

Official Rust Client for Elasticsearch.

Full documentation is available at https://docs.rs/elasticsearch

The project is still very much a work in progress and in an alpha state; input and contributions welcome!

Compatibility

The Elasticsearch Rust client is forward compatible; meaning that the client supports communicating with greater minor versions of Elasticsearch. Elasticsearch language clients are also backwards compatible with lesser supported minor Elasticsearch versions.

Features

The following are a list of Cargo features that can be enabled or disabled:

• native-tls (enabled by default): Enables TLS functionality provided by native-tls.
• rustls-tls: Enables TLS functionality provided by rustls.
• beta-apis: Enables beta APIs. Beta APIs are on track to become stable and permanent features. Use them with caution because it is possible that breaking changes are made to these APIs in a minor version.
• experimental-apis: Enables experimental APIs. Experimental APIs are just that - an experiment. An experimental API might have breaking changes in any future version, or it might even be removed entirely. This feature also enables beta-apis.

Getting started

The client exposes all Elasticsearch APIs as associated functions, either on the root client, Elasticsearch, or on one of the namespaced clients, such as Cat, Indices, etc. The namespaced clients are based on the grouping of APIs within the Elasticsearch and X-Pack REST API specs from which much of the client is generated. All API functions are async only, and can be awaited.

Installing

Add elasticsearch crate and version to Cargo.toml. Choose the version that is compatible with the version of Elasticsearch you're using

toml [dependencies] elasticsearch = "8.7.0-alpha.1"

The following optional dependencies may also be useful to create requests and read responses

toml serde = "~1" serde_json = "~1"

Async support with tokio

The client uses reqwest to make HTTP calls, which internally uses the tokio runtime for async support. As such, you may require to take a dependency on tokio in order to use the client. For example, in Cargo.toml, you may need the following dependency,

toml tokio = { version = "*", features = ["full"] }

and to attribute async main function with #[tokio::main]

```rust,no_run

[tokio::main]

async fn main() -> Result<(), Box> { // your code ... Ok(()) } ```

and attribute test functions with #[tokio::test]

```rust,no_run

[tokio::test]

async fn my_test() -> Result<(), Box> { // your code ... Ok(()) } ```

Create a client

Build a transport to make API requests to Elasticsearch using the TransportBuilder, which allows setting of proxies, authentication schemes, certificate validation, and other transport related settings.

To create a client to make API calls to Elasticsearch running on http://localhost:9200

```rust,no_run use elasticsearch::Elasticsearch;

fn main() { let client = Elasticsearch::default(); } ``` Alternatively, you can create a client to make API calls against Elasticsearch running on a specific url

```rust,no_run use elasticsearch::{ Elasticsearch, Error, http::transport::Transport };

fn main() -> Result<(), Error> { let transport = Transport::single_node("https://example.com")?; let client = Elasticsearch::new(transport); Ok(()) } ```

If you're running against an Elasticsearch deployment in Elastic Cloud, a client can be created using a Cloud ID and credentials retrieved from the Cloud web console

```rust,no_run use elasticsearch::{ auth::Credentials, Elasticsearch, Error, http::transport::Transport, };

fn main() -> Result<(), Error> { let cloudid = "clustername:Y2xvdWQtZW5kcG9pbnQuZXhhbXBsZSQzZGFkZjgyM2YwNTM4ODQ5N2VhNjg0MjM2ZDkxOGExYQ=="; // can use other types of Credentials too, like Bearer or ApiKey let credentials = Credentials::Basic("".into(), "".into()); let transport = Transport::cloud(cloud_id, credentials)?; let client = Elasticsearch::new(transport); Ok(()) } ```

More control over how a Transport is built can be achieved using TransportBuilder to build a transport, and passing it to Elasticsearch::new() create a new instance of Elasticsearch

```rust,no_run use url::Url; use elasticsearch::{ Error, Elasticsearch, http::transport::{TransportBuilder,SingleNodeConnectionPool}, };

fn main() -> Result<(), Error> { let url = Url::parse("https://example.com")?; let connpool = SingleNodeConnectionPool::new(url); let transport = TransportBuilder::new(connpool).disable_proxy().build()?; let client = Elasticsearch::new(transport); Ok(()) } ```

Making API calls

The following will execute a POST request to /_search?allow_no_indices=true with a JSON body of {"query":{"match_all":{}}}

```rust,norun use elasticsearch::{Elasticsearch, Error, SearchParts}; use serdejson::{json, Value};

[tokio::main]

async fn main() -> Result<(), Box> { let client = Elasticsearch::default();

// make a search API call
let search_response = client
    .search(SearchParts::None)
    .body(json!({
        "query": {
            "match_all": {}
        }
    }))
    .allow_no_indices(true)
    .send()
    .await?;

// get the HTTP response status code
let status_code = search_response.status_code();

// read the response body. Consumes search_response
let response_body = search_response.json::<Value>().await?;

// read fields from the response body
let took = response_body["took"].as_i64().unwrap();

Ok(())

} ```

The client provides functions on each API builder struct for all query string parameters available for that API. APIs with multiple URI path variants, where some can contain parts parameters, are modelled as enums.

Elasticsearch also has an async send function on the root that allows sending an API call to an endpoint not represented as an API function, for example, experimental and beta APIs

```rust,norun use elasticsearch::{http::Method, Elasticsearch, Error, SearchParts}; use http::HeaderMap; use serdejson::Value;

[tokio::main]

async fn main() -> Result<(), Box> { let client = Elasticsearch::default(); let body = b"{\"query\":{\"matchall\":{}}}"; let response = client .send( Method::Post, SearchParts::Index(&["tweets"]).url().asref(), HeaderMap::new(), Option::<&Value>::None, Some(body.as_ref()), None, ) .await?; Ok(()) } ```

License

This is free software, licensed under The Apache License Version 2.0..