Remove experimental flag from append_fields (#16576) (#16598)

closes #15605

CHANGELOG.next.asciidoc

@@ -178,6 +178,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Include network information by default on add_host_metadata and add_observer_metadata. {issue}15347[15347] {pull}16077[16077]
 - Add `aws_ec2` provider for autodiscover. {issue}12518[12518] {pull}14823[14823]
 - Add support for multiple password in redis output. {issue}16058[16058] {pull}16206[16206]
+- Remove experimental flag from `setup.template.append_fields` {pull}16576[16576]
 
 *Auditbeat*
 

auditbeat/auditbeat.reference.yml

@@ -1033,7 +1033,6 @@ output.elasticsearch:
 
 # A list of fields to be added to the template and Kibana index pattern. Also
 # specify setup.template.overwrite: true to overwrite the existing template.
-# This setting is experimental.
 #setup.template.append_fields:
 #- name: field_name
 #  type: field_type

filebeat/filebeat.reference.yml

@@ -1738,7 +1738,6 @@ output.elasticsearch:
 
 # A list of fields to be added to the template and Kibana index pattern. Also
 # specify setup.template.overwrite: true to overwrite the existing template.
-# This setting is experimental.
 #setup.template.append_fields:
 #- name: field_name
 #  type: field_type

heartbeat/heartbeat.reference.yml

@@ -1177,7 +1177,6 @@ output.elasticsearch:
 
 # A list of fields to be added to the template and Kibana index pattern. Also
 # specify setup.template.overwrite: true to overwrite the existing template.
-# This setting is experimental.
 #setup.template.append_fields:
 #- name: field_name
 #  type: field_type

journalbeat/journalbeat.reference.yml

@@ -971,7 +971,6 @@ output.elasticsearch:
 
 # A list of fields to be added to the template and Kibana index pattern. Also
 # specify setup.template.overwrite: true to overwrite the existing template.
-# This setting is experimental.
 #setup.template.append_fields:
 #- name: field_name
 #  type: field_type

libbeat/_meta/config.reference.yml.tmpl

@@ -914,7 +914,6 @@ output.elasticsearch:
 
 # A list of fields to be added to the template and Kibana index pattern. Also
 # specify setup.template.overwrite: true to overwrite the existing template.
-# This setting is experimental.
 #setup.template.append_fields:
 #- name: field_name
 #  type: field_type

libbeat/docs/template-config.asciidoc

@@ -83,17 +83,16 @@ setup.template.settings:
   _source.enabled: false
 ----------------------------------------------------------------------
 
-ifeval::["{beatname_lc}"!="apm-server"]
-*`setup.template.append_fields`* experimental[]:: A list of fields to be added
+*`setup.template.append_fields`*:: A list of fields to be added
 to the template and {kib} index pattern. This setting adds new fields. It does
-not overwrite or change existing fields. 
+not overwrite or change existing fields.
 +
 This setting is useful when your data contains fields that {beatname_uc} doesn't
-know about in advance. 
+know about in advance.
 ifeval::["{beatname_lc}"=="metricbeat"]
 For example, you might want to append fields to the template when you're using
 a metricset, such as the <<metricbeat-metricset-http-json>>, and the full data
-structure is not known in advance. 
+structure is not known in advance.
 endif::[]
 +
 If `append_fields` is specified along with `overwrite: true`, {beatname_uc}
@@ -118,7 +117,7 @@ setup.template.append_fields:
 
 *`setup.template.json.enabled`*:: Set to `true` to load a
 JSON-based template file. Specify the path to your {es} index template file and
-set the name of the template. 
+set the name of the template.
 +
 ["source","yaml",subs="attributes"]
 ----------------------------------------------------------------------
@@ -129,5 +128,3 @@ setup.template.json.name: "template-name
 
 NOTE: If the JSON template is used, the `fields.yml` is skipped for the template
 generation.
-
-endif::[]

libbeat/template/template.go

@@ -26,7 +26,6 @@ import (
 
 	"github.com/elastic/beats/libbeat/beat"
 	"github.com/elastic/beats/libbeat/common"
-	"github.com/elastic/beats/libbeat/common/cfgwarn"
 	"github.com/elastic/beats/libbeat/common/fmtstr"
 	"github.com/elastic/beats/libbeat/mapping"
 )
@@ -145,7 +144,6 @@ func (t *Template) load(fields mapping.Fields) (common.MapStr, error) {
 
 	var err error
 	if len(t.config.AppendFields) > 0 {
-		cfgwarn.Experimental("append_fields is used.")
 		fields, err = mapping.ConcatFields(fields, t.config.AppendFields)
 		if err != nil {
 			return nil, err

metricbeat/metricbeat.reference.yml

@@ -1725,7 +1725,6 @@ output.elasticsearch:
 
 # A list of fields to be added to the template and Kibana index pattern. Also
 # specify setup.template.overwrite: true to overwrite the existing template.
-# This setting is experimental.
 #setup.template.append_fields:
 #- name: field_name
 #  type: field_type

packetbeat/packetbeat.reference.yml

@@ -1455,7 +1455,6 @@ output.elasticsearch:
 
 # A list of fields to be added to the template and Kibana index pattern. Also
 # specify setup.template.overwrite: true to overwrite the existing template.
-# This setting is experimental.
 #setup.template.append_fields:
 #- name: field_name
 #  type: field_type

winlogbeat/winlogbeat.reference.yml

@@ -956,7 +956,6 @@ output.elasticsearch:
 
 # A list of fields to be added to the template and Kibana index pattern. Also
 # specify setup.template.overwrite: true to overwrite the existing template.
-# This setting is experimental.
 #setup.template.append_fields:
 #- name: field_name
 #  type: field_type

x-pack/auditbeat/auditbeat.reference.yml

@@ -1084,7 +1084,6 @@ output.elasticsearch:
 
 # A list of fields to be added to the template and Kibana index pattern. Also
 # specify setup.template.overwrite: true to overwrite the existing template.
-# This setting is experimental.
 #setup.template.append_fields:
 #- name: field_name
 #  type: field_type

x-pack/filebeat/filebeat.reference.yml

@@ -2284,7 +2284,6 @@ output.elasticsearch:
 
 # A list of fields to be added to the template and Kibana index pattern. Also
 # specify setup.template.overwrite: true to overwrite the existing template.
-# This setting is experimental.
 #setup.template.append_fields:
 #- name: field_name
 #  type: field_type

x-pack/functionbeat/functionbeat.reference.yml

@@ -982,7 +982,6 @@ output.elasticsearch:
 
 # A list of fields to be added to the template and Kibana index pattern. Also
 # specify setup.template.overwrite: true to overwrite the existing template.
-# This setting is experimental.
 #setup.template.append_fields:
 #- name: field_name
 #  type: field_type

x-pack/metricbeat/metricbeat.reference.yml

@@ -1958,7 +1958,6 @@ output.elasticsearch:
 
 # A list of fields to be added to the template and Kibana index pattern. Also
 # specify setup.template.overwrite: true to overwrite the existing template.
-# This setting is experimental.
 #setup.template.append_fields:
 #- name: field_name
 #  type: field_type

x-pack/winlogbeat/winlogbeat.reference.yml

@@ -959,7 +959,6 @@ output.elasticsearch:
 
 # A list of fields to be added to the template and Kibana index pattern. Also
 # specify setup.template.overwrite: true to overwrite the existing template.
-# This setting is experimental.
 #setup.template.append_fields:
 #- name: field_name
 #  type: field_type