Add applies_to to reference/ingest-tools/index.md

Author: vishaangelova

reference/ingestion-tools/index.md

@@ -1,17 +1,22 @@
+---
+applies_to:
+  stack: ga
+  serverless: ga
+---
+
 # Ingestion tools
 
 This section contains reference information for ingestion tools, including:
 
-* Fleet and agent
-* APM
-* Beats
-* Processor reference
-* Logstash
-* Logstash Plugins
-* Logstash Versioned Plugin Reference
-* Elastic Serverless forwarder for AWS
-* Content connectors
-* ES for Apache Hadoop
-* Elastic in integrations
+* [{{fleet}} and {{agent}}](/reference/fleet/index.md)
+* [APM](/reference/apm/observability/apm.md)
+* [{{beats}}](beats://reference/index.md)
+* [{{ls}}](logstash://reference/index.md)
+* [{{ls}} Plugins](logstash-docs-md://lsr/index.md)
+* [{{ls}} Versioned Plugin Reference](logstash-docs-md://vpr/index.md)
+* [Elastic Serverless Forwarder for AWS](elastic-serverless-forwarder://reference/index.md)
+* [Content connectors](elasticsearch://reference/search-connectors/index.md)
+* [{{es}} for Apache Hadoop](elasticsearch-hadoop://reference/index.md)
+* [Elastic integrations](integration-docs://reference/index.md)
 
-For introductory content and broader overviews, check out the [Ingest tools overview](/manage-data/ingest/tools.md) documentation.
+For introductory content and broader overviews, check out [Ingest tools overview](/manage-data/ingest/tools.md).