[DOC] Updating projects with respective Github repos for filing issues. Also moved es-on-yarn to the bottom and added the beta tag.

Author: acchen97

docs/src/reference/asciidoc/index.adoc

@@ -27,14 +27,14 @@
 
 {ehtm} is an `umbrella' project consisting of three similar, yet independent sub-projects with their own, dedicated, section in the documentation:
 
-{ey}:: run {es} on top of YARN - see <<es-yarn>>
+{eh} proper:: interact with {es} from within a Hadoop environment. If you are using {mr}, Hive, Pig, {sp}, {st}, or Cascading, this project is for you. For feature requests or bugs, please open an issue in the https://github.com/elastic/elasticsearch-hadoop/issues[Elasticsearch-Hadoop repository].
 
-repository-hdfs:: use HDFS as a back-end repository for doing snapshot/restore from/to {es}. For more information, refer to its https://www.elastic.co/guide/en/elasticsearch/plugins/master/repository-hdfs.html[home page]
+repository-hdfs:: use HDFS as a back-end repository for doing snapshot/restore from/to {es}. For more information, refer to its https://www.elastic.co/guide/en/elasticsearch/plugins/master/repository-hdfs.html[home page]. For feature requests or bugs, please open an issue in the https://github.com/elastic/elasticsearch/issues[Elasticsearch repository] with the ":Plugin Repository HDFS" tag.
 
-{eh} proper:: interact with {es} from within a Hadoop environment. If you are using {mr}, Cascading, Hive, Pig, {sp} or {st}, this project is for you.
+{ey}:: run {es} on top of YARN - see <<es-yarn>>. This project is in beta.
 
 
-Thus, while all projects fall under the Hadoop umbrella, each is covering a certain aspect of it so please be sure to read the appropriate documentation.
+Thus, while all projects fall under the Hadoop umbrella, each is covering a certain aspect of it so please be sure to read the appropriate documentation. For general questions around any of these projects, the https://discuss.elastic.co/c/elasticsearch-and-hadoop[Elastic Discuss forum] is a great place to interact with other users in the community.
 
 include::yarn/index.adoc[]
 

repository-hdfs/README.md

@@ -2,7 +2,7 @@
 
 The HDFS Snapshot/Restore plugin has been [_moved_](https://github.com/elastic/elasticsearch/issues/15191) into Elasticsearch proper. When upgrading, please keep in mind that the `light` and `1.x` versions are no longer supported in 5.x. 
 
-More information can be found [here](https://www.elastic.co/guide/en/elasticsearch/plugins/master/repository-hdfs.html).
+More information can be found [here](https://www.elastic.co/guide/en/elasticsearch/plugins/master/repository-hdfs.html). For feature requests or bugs regarding the Repository HDFS plugin, please open an issue in the [Elasticsearch repository](https://github.com/elastic/elasticsearch/issues) with the ":Plugin Repository HDFS" tag.
 
 ## ES-Hadoop 2.x instructions below