Added more breaking changes to the 9.0 docs

docs/reference/toc.yml

@@ -42,6 +42,8 @@ toc:
       - file: no-such-method-request-options.md
       - file: io-reactor-errors.md
       - file: serialize-without-typed-keys.md
+      - file: could-not-resolve-dependencies.md
+      - file: no-class-def-found-error.md
 
   - folder: transport
     children:

docs/reference/troubleshooting/could-not-resolve-dependencies.md

@@ -0,0 +1,9 @@
+---
+navigation_title: Could not resolve dependencies
+mapped_pages:
+  - https://www.elastic.co/guide/en/elasticsearch/client/java-api-client/current/could-not-resolve-dependencies.html
+---
+
+# Could not resolve dependencies
+
+Check the [Known Issues](/release-notes/known-issues.md#known-issues-8-16-7)

docs/reference/troubleshooting/index.md

@@ -10,6 +10,8 @@ mapped_pages:
 * [](missing-required-property.md)
 * [](no-such-method-request-options.md)
 * [](io-reactor-errors.md)
+* [](could-not-resolve-dependencies.md)
+* [](no-class-def-found-error.md)
 
 ## Miscellaneous
 

docs/reference/troubleshooting/no-class-def-found-error.md

@@ -0,0 +1,9 @@
+---
+navigation_title: "NoClassDefFoundError: LogFactory"
+mapped_pages:
+  - https://www.elastic.co/guide/en/elasticsearch/client/java-api-client/current/no-class-def-found-error.html
+---
+
+# `NoClassDefFoundError`: org/apache/commons/logging/LogFactory
+
+Check the [Known Issues](/release-notes/known-issues.md#known-issues-9-0-0)

docs/release-notes/9-0-0.md

@@ -7,6 +7,40 @@ Discover what changed in the 9.0.0 version of the Java client.
 
 ### Breaking changes [elasticsearch-java-client-900-breaking-changes]
 
+::::{dropdown} Java version update  
+While previous versions of the client used to target Java 8, from version 9.0 forward the client will target Java 17.
+
+**Impact**<br>
+Any project that targets Java 8 and needs to import version 9.0 of the elasticsearch Java client.  
+
+**Action**<br>
+Projects that import version 9.0 of the elasticsearch Java client as a dependency will have to be updated to be compatible Java 17.
+
+::::
+
+::::{dropdown} RestClient optional dependency  
+The new version of the client introduces the [Rest5Client](/reference/transport/rest5-client/index.md) as an alternative to the legacy RestClient. The RestClient is part of the external dependency `elasticsearch-rest-client`, which is now optional since an alternative is available.
+
+**Impact**<br>
+Any project updating the elasticsearch Java client.  
+
+**Action**<br>
+Either update the code to use the new [Rest5Client](/reference/transport/rest5-client/index.md) or import the `elasticsearch-rest-client` dependency:
+```kotlin
+// gradle
+implementation("org.elasticsearch.client:elasticsearch-rest-client:9.0.0")
+```
+```xml
+<!--maven-->
+<dependency>
+    <groupId>org.elasticsearch.client</groupId>
+    <artifactId>elasticsearch-rest-client</artifactId>
+    <version>9.0.0</version>
+</dependency>
+```
+
+::::
+
 ::::{dropdown} Server accurate aggregation number values  
 In previous versions of the client, when the server returned number that was both always present and could be `null` (for example Aggregation results), the client would default to `0` and deserialize the number into a primitive data type instead of an Object. This design choice was changed in this version, changing the fields type to support `null` and be coherent with the server response.
 
@@ -329,7 +363,7 @@ ElasticsearchClient esClient = ElasticsearchClient.of(b -> b
         .apiKey(apiKey)
 );
 ```
-The classic version of the builder is still available, both with the new `Rest5Client` and the legacy `RestClient`; while the `Rest5Client` is included with the java client's dependency, the legacy `RestClient` must be imported separately:
+The classic version of the builder is still available, both with the new `Rest5Client` and the legacy `RestClient`; while the `Rest5Client` is included with the Java client's dependency, the legacy `RestClient` must be imported separately:
 ```
 implementation("org.elasticsearch.client:elasticsearch-rest-client:9.0.0")
 ```

docs/release-notes/known-issues.md

@@ -6,3 +6,50 @@ navigation_title: "Known issues"
 # Elasticsearch Java Client known issues [elasticsearch-java-client-known-issues]
 
 We handle all of our issues in our [Github repo](https://github.com/elastic/elasticsearch-java/issues).
+
+### 8.16.7 [known-issues-8-16-7]
+
+8.16.7 is the first patch released without a matching rest-client version, so the `elasticsearch-rest-client` dependency is missing, causing the following exception:
+```
+Could not resolve dependencies for project
+[ERROR] dependency: org.elasticsearch.client:elasticsearch-rest-client:jar:8.16.7 (compile)
+[ERROR] 	Could not find artifact org.elasticsearch.client:elasticsearch-rest-client:jar:8.16.7 in central (https://repo.maven.apache.org/maven2)
+```
+To use this version of the client, set the latest available version explicitly in the project:
+```kotlin
+// gradle
+implementation("org.elasticsearch.client:elasticsearch-rest-client:8.16.6")
+```
+```xml
+<!--maven-->
+<dependency>
+    <groupId>org.elasticsearch.client</groupId>
+    <artifactId>elasticsearch-rest-client</artifactId>
+    <version>8.16.6</version>
+</dependency>
+```
+
+### 9.0.0 [known-issues-9-0-0]
+
+The latest major version of the client doesn't depend on `elasticsearch-rest-client` anymore, as the new built in Rest5Client is available, but it does depend on the Apache `commons-logging` dependency, which is missing, causing the following exception:
+```
+Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
+	at co.elastic.clients.transport.rest5_client.low_level.Rest5Client.<clinit>(Rest5Client.java:115)
+	at co.elastic.clients.transport.rest5_client.Rest5ClientTransport.buildRest5Client(Rest5ClientTransport.java:65)
+	at co.elastic.clients.transport.rest5_client.Rest5ClientTransport.<init>(Rest5ClientTransport.java:42)
+	at co.elastic.clients.transport.ElasticsearchTransportConfig$Default.buildTransport(ElasticsearchTransportConfig.java:110)
+	at co.elastic.clients.elasticsearch.ElasticsearchClient.of(ElasticsearchClient.java:190)
+```
+To use the new Rest5Client, add the `commons-logging` dependency:
+```kotlin
+// gradle
+implementation("commons-logging:commons-logging:1.3.5")
+```
+```xml
+<!--maven-->
+<dependency>
+    <groupId>commons-logging</groupId>
+    <artifactId>commons-logging</artifactId>
+    <version>1.3.5</version>
+</dependency>
+```