[7.7][docs] Backport: Fix netflow field docs by removing duplicate topic (#16784)

filebeat/docs/fields.asciidoc

@@ -46,7 +46,6 @@ grouped in the following categories:
 * <<exported-fields-mysql>>
 * <<exported-fields-nats>>
 * <<exported-fields-netflow>>
-* <<exported-fields-netflow-module>>
 * <<exported-fields-nginx>>
 * <<exported-fields-o365>>
 * <<exported-fields-okta>>
@@ -21602,12 +21601,6 @@ type: short
 
 --
 
-[[exported-fields-netflow-module]]
-== NetFlow fields
-
-Module for receiving NetFlow and IPFIX flow records over UDP. The module does not add fields beyond what the netflow input provides.
-
-
 [[exported-fields-nginx]]
 == Nginx fields
 

libbeat/scripts/generate_fields_docs.py

@@ -6,6 +6,8 @@
 
 
 def document_fields(output, section, sections, path):
+    if "skipdocs" in section:
+        return
     if "anchor" in section:
         output.write("[[exported-fields-{}]]\n".format(section["anchor"]))
 
@@ -136,7 +138,8 @@ def fields_to_asciidoc(input, output, beat):
         if "anchor" not in section:
             section["anchor"] = section["key"]
 
-        output.write("* <<exported-fields-{}>>\n".format(section["anchor"]))
+        if "skipdocs" not in section:
+            output.write("* <<exported-fields-{}>>\n".format(section["anchor"]))
     output.write("\n--\n")
 
     # Sort alphabetically by key

x-pack/filebeat/module/netflow/_meta/fields.yml

@@ -3,4 +3,4 @@
   description: >
     Module for receiving NetFlow and IPFIX flow records over UDP. The module
     does not add fields beyond what the netflow input provides.
-  fields:
+  skipdocs: