[FLINK-10880] Add release notes warning to not use Flink's failover strategy

Author: tillrohrmann

docs/release-notes/flink-1.5.md

@@ -80,5 +80,13 @@ The Kinesis dependencies of Flink’s Kinesis connector have been updated to the
 <aws.kinesis-kpl.version>0.12.9</aws.kinesis-kcl.version>
 ```
 
+<!-- Remove once FLINK-10712 has been fixed -->
+### Limitations of failover strategies
+Flink's non-default failover strategies are still a very experimental feature which come with a set of limitations.
+You should only use this feature if you are executing a stateless streaming job.
+In any other cases, it is highly recommended to remove the config option `jobmanager.execution.failover-strategy` from your `flink-conf.yaml` or set it to `"full"`.
+
+In order to avoid future problems, this feature has been removed from the documentation until it will be fixed.
+See [FLINK-10880](https://issues.apache.org/jira/browse/FLINK-10880) for more details.
 
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docs/release-notes/flink-1.6.md

@@ -29,6 +29,15 @@ The default value of the slot idle timeout `slot.idle.timeout` is set to the def
 ### Changed ElasticSearch 5.x Sink API
 
 Previous APIs in the Flink ElasticSearch 5.x Sink's `RequestIndexer` interface have been deprecated in favor of new signatures. 
-When adding requests to the `RequestIndexer`, the requests now must be of type `IndexRequest`, `DeleteRequest`, or `UpdateRequest`, instead of the base `ActionRequest`. 
+When adding requests to the `RequestIndexer`, the requests now must be of type `IndexRequest`, `DeleteRequest`, or `UpdateRequest`, instead of the base `ActionRequest`.
+
+<!-- Remove once FLINK-10712 has been fixed -->
+### Limitations of failover strategies
+Flink's non-default failover strategies are still a very experimental feature which come with a set of limitations.
+You should only use this feature if you are executing a stateless streaming job.
+In any other cases, it is highly recommended to remove the config option `jobmanager.execution.failover-strategy` from your `flink-conf.yaml` or set it to `"full"`.
+
+In order to avoid future problems, this feature has been removed from the documentation until it will be fixed.
+See [FLINK-10880](https://issues.apache.org/jira/browse/FLINK-10880) for more details. 
 
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docs/release-notes/flink-1.7.md

@@ -30,4 +30,13 @@ Therefore, the module `flink-scala-shell` is not being released for Scala 2.12.
 
 See [FLINK-10911](https://issues.apache.org/jira/browse/FLINK-10911) for more details.  
 
+<!-- Remove once FLINK-10712 has been fixed -->
+### Limitations of failover strategies
+Flink's non-default failover strategies are still a very experimental feature which come with a set of limitations.
+You should only use this feature if you are executing a stateless streaming job.
+In any other cases, it is highly recommended to remove the config option `jobmanager.execution.failover-strategy` from your `flink-conf.yaml` or set it to `"full"`.
+
+In order to avoid future problems, this feature has been removed from the documentation until it will be fixed.
+See [FLINK-10880](https://issues.apache.org/jira/browse/FLINK-10880) for more details. 
+
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