[Ingest Manager] Document fleet configuration flags (elastic#66736)

docs/settings/ingest-manager-settings.asciidoc

@@ -0,0 +1,65 @@
+[role="xpack"]
+[[ingest-manager-settings-kb]]
+=== {ingest-manager} settings in {kib}
+++++
+<titleabbrev>{ingest-manager} settings</titleabbrev>
+++++
+
+You can configure `xpack.ingestManager` settings in your `kibana.yml`. 
+By default, {ingest-manager} is not enabled. You need to enable it. To use {fleet}, you also need to configure {kib} and {es} hosts.
+
+[[general-ingest-manager-settings-kb]]
+==== General {ingest-manager} settings
+
+[cols="2*<"]
+|===
+| `xpack.ingestManager.enabled` {ess-icon}
+  | Set to `true` to enable {ingest-manager}. 
+|===
+
+[cols="2*<"]
+|===
+| `xpack.ingestManager.epm.enabled` {ess-icon}
+  | Set to `true` (default) to enable {package-manager}. 
+|===
+
+[cols="2*<"]
+|===
+| `xpack.ingestManager.fleet.enabled` {ess-icon}
+  | Set to `true` (default) to enable {fleet}. 
+|===
+
+[[ingest-manager-data-visualizer-settings]]
+
+==== {package-manager} settings
+
+[cols="2*<"]
+|===
+| `xpack.ingestManager.epm.registryUrl`
+  | The address to use to reach {package-manager} registry.
+|===
+
+==== {fleet} settings
+
+[cols="2*<"]
+|===
+| `xpack.ingestManager.fleet.kibana.host`
+  | The hostname used by {agent} for accessing {kib}.
+|===
+
+[cols="2*<"]
+|===
+| `xpack.ingestManager.fleet.elasticsearch.host`
+  | The hostname used by {agent} for accessing {es}.
+|===
+
+[cols="2*<"]
+|===
+| `xpack.ingestManager.fleet.tlsCheckDisabled`
+  | Set to `true` to allow {fleet} to run on a {kib} instance without TLS enabled.
+|===
+
+[NOTE]
+====
+In {ecloud}, {fleet} flags are already configured.
+====

docs/settings/settings-xkb.asciidoc

@@ -20,3 +20,4 @@ include::ml-settings.asciidoc[]
 include::reporting-settings.asciidoc[]
 include::spaces-settings.asciidoc[]
 include::i18n-settings.asciidoc[]
+include::ingest-manager-settings.asciidoc[]

docs/setup/settings.asciidoc

@@ -643,3 +643,4 @@ include::secure-settings.asciidoc[]
 include::{kib-repo-dir}/settings/security-settings.asciidoc[]
 include::{kib-repo-dir}/settings/spaces-settings.asciidoc[]
 include::{kib-repo-dir}/settings/telemetry-settings.asciidoc[]
+include::{docdir}/settings/ingest-manager-settings.asciidoc[]