Remove beta status and simplify README

Author: swallez

README.md

@@ -4,12 +4,6 @@
 
 The official Java client for [Elasticsearch](https://github.com/elastic/elasticsearch).
 
----
-
-**Note: this project is still in beta.** This client is meant to replace the existing [Java High Level Client](https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/java-rest-high.html) and remove all dependencies to the Elasticsearch server code base.
-
----
-
 The Java client for Elasticsearch provides strongly typed requests and responses for all Elasticsearch APIs. It delegates protocol handling to an http client such as the [Elasticsearch Low Level REST client](https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/java-rest-low.html) that takes care of all transport-level concerns (http connection establishment and pooling, retries, etc).
 
 The `docs/design` folder contains records of the major decisions in the design of the API. Most notably:
@@ -18,88 +12,10 @@ The `docs/design` folder contains records of the major decisions in the design o
 - Nested objects can be constructed with builder lambdas, allowing for clean and expressive DSL-like code.
 - Optional values are represented as `null` with `@Nullable` annotations instead of the newer  `Optional`, the Java ecosystem being still very null-based.
 
-## Getting started
+## Documentation
 
 Please refer to [the full documentation on elastic.co](https://www.elastic.co/guide/en/elasticsearch/client/java-api-client/current/index.html) for comprehensive information.
 
-### Installing the library
-
-This library requires at least Java 8.
-
-Along with this library, you also need a JSON/object mapping library. `elasticsearch-java` has built-in support for [Jackson](https://github.com/FasterXML/jackson) and [JSON-B](http://json-b.net/) implementations such as [Eclipse Yasson](https://github.com/eclipse-ee4j/yasson).
-
-Releases are hosted on [Maven Central](https://search.maven.org/search?q=g:co.elastic.clients). If you are looking for a SNAPSHOT version, the Elastic Maven Snapshot repository is available at https://snapshots.elastic.co/maven/.
-
-Gradle project (Groovy flavor) setup using Jackson:
-
-```groovy
-dependencies {
-    implementation 'co.elastic.clients:elasticsearch-java:7.15.0'
-    implementation 'com.fasterxml.jackson.core:jackson-databind:2.12.3'
-}
-```
-
-In the `pom.xml` for your project add the following repository definition and dependencies:
-
-```xml
-<project>
-  <dependencies>
-    <dependency>
-      <groupId>co.elastic.clients</groupId>
-      <artifactId>elasticsearch-java</artifactId>
-      <version>7.15.0</version>
-    </dependency>
-    <dependency>
-      <groupId>com.fasterxml.jackson.core</groupId>
-      <artifactId>jackson-databind</artifactId>
-      <version>2.12.3</version>
-    </dependency>
-  </dependencies>
-
-</project>
-```
-
-### Your first request
-
-```java
-// Create the low-level client
-RestClient restClient = RestClient.builder(new HttpHost("localhost", 9200)).build();
-
-// Create the transport that provides JSON and http services to API clients
-Transport transport = new RestClientTransport(restClient, new JacksonJsonpMapper());
-
-// And create our API client
-ElasticsearchClient client = new ElasticsearchClient(transport);
-
-// Search all items in an index that contains documents of type AppData
-SearchResponse search = client.search(s -> s
-    .index("test-index"),
-    AppData.class
-);
-
-if (search.hits().hits().isEmpty()) {
-    System.out.println("No match");
-} else {
-    for (Hit<AppData> hit : search.hits().hits()) {
-        processAppData(hit._source());
-    }
-}
-```
-
-## Compatibility
-
-The `main` branch targets the next major release (8.0) and the `7.x` branch targets the next minor release. Support is still incomplete as the API code is generated from the [Elasticsearch Specification](https://github.com/elastic/elasticsearch-specification) that is also still a work in progress.
-
-The Elasticsearch Java client is forward compatible; meaning that the client supports communicating with greater minor versions of Elasticsearch. Elastic language clients are also backwards compatible with lesser supported minor Elasticsearch versions.
-
-## Current status
-
-Beta state means we don't expect large architectural changes and the library is already fairly usable. This library also essentially deals with request & response serialization & deserialization and delegates all http request processing to the battle-tested [Low Level Rest Client](https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/java-rest-low.html).
-
-What's missing falls in two main categories, related to the [Elasticsearch specification](https://github.com/elastic/elasticsearch-specification):
-* incomplete support for some data types used in specification (e.g. unions). Until they have been implemented in the code generator, they are represented as raw `JsonValue` objects.
-* incomplete APIs: as the API specification is still incomplete, so are their implementations in this library since their code is entirely generated from the spec.
-
 ## Contributing
 
 See [CONTRIBUTING.md](./CONTRIBUTING.md)