Add Beats upgrade docs for 8.0 (#30355)

(cherry picked from commit c26cea6)

# Conflicts:
#	libbeat/docs/upgrading.asciidoc

libbeat/docs/tab-widgets/load-index-template-widget.asciidoc

@@ -0,0 +1,112 @@
+++++
+<div class="tabs" data-tab-group="os">
+  <div role="tablist" aria-label="Load index template">
+    <button role="tab"
+            aria-selected="true"
+            aria-controls="deb-tab-load-index-template"
+            id="deb-load-index-template">
+      DEB
+    </button>
+    <button role="tab"
+            aria-selected="false"
+            aria-controls="rpm-tab-load-index-template"
+            id="rpm-load-index-template"
+            tabindex="-1">
+      RPM
+    </button>
+    <button role="tab"
+            aria-selected="false"
+            aria-controls="mac-tab-load-index-template"
+            id="mac-load-index-template"
+            tabindex="-1">
+      MacOS
+    </button>
+    <button role="tab"
+            aria-selected="false"
+            aria-controls="linux-tab-load-index-template"
+            id="linux-load-index-template"
+            tabindex="-1">
+      Linux
+    </button>
+    <button role="tab"
+            aria-selected="false"
+            aria-controls="docker-tab-load-index-template"
+            id="docker-load-index-template"
+            tabindex="-1">
+      Docker
+    </button>
+    <button role="tab"
+            aria-selected="false"
+            aria-controls="win-tab-load-index-template"
+            id="win-load-index-template"
+            tabindex="-1">            
+      Windows
+    </button>
+  </div>
+  <div tabindex="0"
+       role="tabpanel"
+       id="deb-tab-load-index-template"
+       aria-labelledby="deb-load-index-template">
+++++
+
+include::load-index-template.asciidoc[tag=deb]
+
+++++
+  </div>
+  <div tabindex="0"
+       role="tabpanel"
+       id="rpm-tab-load-index-template"
+       aria-labelledby="rpm-load-index-template"
+       hidden="">
+++++
+
+include::load-index-template.asciidoc[tag=rpm]
+
+++++
+  </div>
+  <div tabindex="0"
+       role="tabpanel"
+       id="mac-tab-load-index-template"
+       aria-labelledby="mac-load-index-template"
+       hidden="">
+++++
+
+include::load-index-template.asciidoc[tag=mac]
+
+++++
+  </div>
+  <div tabindex="0"
+       role="tabpanel"
+       id="linux-tab-load-index-template"
+       aria-labelledby="linux-load-index-template"
+       hidden="">
+++++
+
+include::load-index-template.asciidoc[tag=linux]
+
+++++
+  </div>
+  <div tabindex="0"
+       role="tabpanel"
+       id="docker-tab-load-index-template"
+       aria-labelledby="docker-load-index-template"
+       hidden="">
+++++
+
+include::load-index-template.asciidoc[tag=docker]
+
+++++
+  </div>
+  <div tabindex="0"
+       role="tabpanel"v
+       id="win-tab-load-index-template"
+       aria-labelledby="win-load-index-template"
+       hidden="">
+++++
+
+include::load-index-template.asciidoc[tag=win]
+
+++++
+  </div>
+</div>
+++++

libbeat/docs/tab-widgets/load-index-template.asciidoc

@@ -0,0 +1,48 @@
+// tag::deb[]
+["source","sh",subs="attributes"]
+----
+{beatname_lc} setup --index-management
+----
+// end::deb[]
+
+// tag::rpm[]
+["source","sh",subs="attributes"]
+----
+{beatname_lc} setup --index-management
+----
+// end::rpm[]
+
+// tag::mac[]
+["source","sh",subs="attributes"]
+----
+./{beatname_lc} setup --index-management
+----
+// end::mac[]
+
+// tag::linux[]
+["source","sh",subs="attributes"]
+----
+./{beatname_lc} setup --index-management
+----
+// end::linux[]
+
+// tag::docker[]
+["source","sh",subs="attributes"]
+----
+docker run --net="host" {dockerimage} setup --index-management
+----
+// end::docker[]
+
+// tag::win[]
+
+Open a PowerShell prompt as an Administrator (right-click the PowerShell icon
+and select *Run As Administrator*).
+
+From the PowerShell prompt, change to the directory where you installed {beatname_uc},
+and run:
+
+["source","sh",subs="attributes"]
+----
+PS > .{backslash}{beatname_lc}.exe setup --index-management
+----
+// end::win[]