[DOCS] Refine docs about EA > Kafka > LS > ES (#1374)

* [DOCS] Refine docs about EA > Kafka > LS > ES

* Update fleet-settings-output-kafka.asciidoc

* Update docs/en/ingest-management/elastic-agent/configuration/outputs/output-kafka.asciidoc

---------

Co-authored-by: David Kilfoyle <[email protected]>

Author: lucabelluccini

docs/en/ingest-management/elastic-agent/configuration/outputs/output-kafka.asciidoc

@@ -46,11 +46,13 @@ outputs:
 
 == Kafka output and using {ls} to index data to {es}
 
-If you are considering using {ls} to ship the data from `kafka` to {es}, please
-be aware Elastic is not currently testing this kind of setup.
+If you are considering using {ls} to ship the data from `kafka` to {es}, please be aware the 
+structure of the documents sent from {agent} to `kafka` must not be modified by {ls}.
+We suggest disabling `ecs_compatibility` on both the `kafka` input and the `json` codec in order
+to make sure the input doesn't edit the fields and their contents.
 
-The structure of the documents sent from {agent} to `kafka` must not be modified by {ls}.
-We suggest disabling `ecs_compatibility` on both the `kafka` input and the `json` codec.
+The data streams set up by the integrations expect to receive events having the same structure and
+field names as they were sent directly from an {agent}.
 
 Refer to <<logstash-output,{ls} output for {agent}>> documentation for more details.
 

docs/en/ingest-management/fleet/fleet-settings-output-kafka.asciidoc

@@ -8,7 +8,12 @@ Specify these settings to send data over a secure connection to Kafka. In the {f
 == Kafka output and using {ls} to index data to {es}
 
 If you are considering using {ls} to ship the data from `kafka` to {es}, please
-be aware Elastic is not currently testing this kind of setup.
+be aware the structure of the documents sent from {agent} to `kafka` must not be modified by {ls}.
+We suggest disabling `ecs_compatibility` on both the `kafka` input and the `json` codec in order
+to make sure the input doesn't edit the fields and their contents.
+
+The data streams setup by the integrations expect to receive events having the same structure and
+field names as they were sent directly from an {agent}.
 
 The structure of the documents sent from {agent} to `kafka` must not be modified by {ls}.
 We suggest disabling `ecs_compatibility` on both the `kafka` input and the `json` codec.