Add docs for Kafka output UI for Fleet managed agents

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

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+
+[[es-output-settings]]
+= {es} output settings
+
+Specify these settings to send data over a secure connection to {es}.
+
+TIP: {es} output must match only the cluster with which {fleet-server} is associated. It's not possible to reference URLs belonging to other {es} clusters.
+
+[cols="2*<a"]
+|===
+|
+[id="es-output-hosts-setting"]
+**Hosts**
+
+| The {es} URLs where {agent}s will send data. By default, {es} is exposed
+on the following ports:
+
+`9200`::
+Default {es} port for self-managed clusters
+
+`443`::
+Default {es} port for {ecloud}
+
+**Examples:**
+
+* `https://192.0.2.0:9200`
+* `https://1d7a52f5eb344de18ea04411fe09e564.fleet.eu-west-1.aws.qa.cld.elstc.co:443`
+* `https://[2001:db8::1]:9200`
+
+// =============================================================================
+
+|
+[id="es-trusted-fingerprint-yaml-setting"]
+**{es} CA trusted fingerprint**
+
+| HEX encoded SHA-256 of a CA certificate. If this certificate is
+present in the chain during the handshake, it will be added to the
+`certificate_authorities` list and the handshake will continue
+normally. To learn more about trusted fingerprints, refer to the
+{ref}/configuring-stack-security.html[{es} security documentation].
+
+// =============================================================================
+
+|
+[id="es-agent-proxy-output"]
+**Proxy**
+
+| Select a proxy URL for {agent} to connect to {es}.
+To learn about proxy configuration, refer to <<fleet-agent-proxy-support>>.
+
+// =============================================================================
+
+|
+[id="es-output-advanced-yaml-setting"]
+**Advanced YAML configuration**
+
+| YAML settings that will be added to the {es} output section of each policy
+that uses this output. Make sure you specify valid YAML. The UI does not
+currently provide validation.
+
+// =============================================================================
+
+|
+[id="es-agent-integrations-output"]
+**Make this output the default for agent integrations**
+
+| When this setting is on, {agent}s use this output to send data if no other
+output is set in the agent policy.
+
+// =============================================================================
+
+|
+[id="es-agent-monitoring-output"]
+**Make this output the default for agent monitoring**
+
+| When this setting is on, {agent}s use this output to send agent monitoring
+data if no other output is set in the agent policy.
+
+Sending monitoring data to a remote {es} cluster is currently not supported.
+|===