Remove logging.files.suffix option and always use datetime suffixes

CHANGELOG.next.asciidoc

@@ -27,6 +27,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - add_process_metadata processor: Replace usage of deprecated `process.ppid` field with `process.parent.pid`. {pull}28620[28620]
 - add_docker_metadata processor: Replace usage of deprecated `process.ppid` field with `process.parent.pid`. {pull}28620[28620]
 - Index template's default_fields setting is only populated with ECS fields. {pull}28596[28596] {issue}28215[28215]
+- Remove options `logging.files.suffix` and default to datetime endings. {pull}28927[28927]
 
 *Auditbeat*
 

auditbeat/auditbeat.reference.yml

@@ -1443,11 +1443,6 @@ logging.files:
   # file. Defaults to true.
   # rotateonstartup: true
 
-  # Rotated files are either suffixed with a number e.g. auditbeat.1 when
-  # renamed during rotation. Or when set to date, the date is added to
-  # the end of the file. On rotation a new file is created, older files are untouched.
-  #suffix: count
-
 # ============================= X-Pack Monitoring ==============================
 # Auditbeat can export internal metrics to a central Elasticsearch monitoring
 # cluster.  This requires xpack monitoring to be enabled in Elasticsearch.  The

filebeat/filebeat.reference.yml

@@ -2355,11 +2355,6 @@ logging.files:
   # file. Defaults to true.
   # rotateonstartup: true
 
-  # Rotated files are either suffixed with a number e.g. filebeat.1 when
-  # renamed during rotation. Or when set to date, the date is added to
-  # the end of the file. On rotation a new file is created, older files are untouched.
-  #suffix: count
-
 # ============================= X-Pack Monitoring ==============================
 # Filebeat can export internal metrics to a central Elasticsearch monitoring
 # cluster.  This requires xpack monitoring to be enabled in Elasticsearch.  The

heartbeat/heartbeat.reference.yml

@@ -1589,11 +1589,6 @@ logging.files:
   # file. Defaults to true.
   # rotateonstartup: true
 
-  # Rotated files are either suffixed with a number e.g. heartbeat.1 when
-  # renamed during rotation. Or when set to date, the date is added to
-  # the end of the file. On rotation a new file is created, older files are untouched.
-  #suffix: count
-
 # ============================= X-Pack Monitoring ==============================
 # Heartbeat can export internal metrics to a central Elasticsearch monitoring
 # cluster.  This requires xpack monitoring to be enabled in Elasticsearch.  The

journalbeat/journalbeat.reference.yml

@@ -1386,11 +1386,6 @@ logging.files:
   # file. Defaults to true.
   # rotateonstartup: true
 
-  # Rotated files are either suffixed with a number e.g. journalbeat.1 when
-  # renamed during rotation. Or when set to date, the date is added to
-  # the end of the file. On rotation a new file is created, older files are untouched.
-  #suffix: count
-
 # ============================= X-Pack Monitoring ==============================
 # Journalbeat can export internal metrics to a central Elasticsearch monitoring
 # cluster.  This requires xpack monitoring to be enabled in Elasticsearch.  The

libbeat/_meta/config/logging.reference.yml.tmpl

@@ -67,8 +67,3 @@ logging.files:
   # Rotate existing logs on startup rather than appending to the existing
   # file. Defaults to true.
   # rotateonstartup: true
-
-  # Rotated files are either suffixed with a number e.g. {{.BeatName}}.1 when
-  # renamed during rotation. Or when set to date, the date is added to
-  # the end of the file. On rotation a new file is created, older files are untouched.
-  #suffix: count