Cherry-pick elastic#5189 to 6.0: cms_get and cmd_set mixed up in memc…

…ached module (elastic#5233)

Cherry-pick of PR elastic#5189 to 6.0 branch. Original message: 

I just created this here and thought to look at the code.

https://discuss.elastic.co/t/metricbeat-memcached-module-seems-to-mix-up-memcached-stats-cmd-get-and-memcached-stats-cmd-set/100732

CHANGELOG.asciidoc

@@ -40,6 +40,8 @@ https://github.com/elastic/beats/compare/v6.0.0-rc1...master[Check the HEAD diff
 
 *Metricbeat*
 
+- Fixed `cmd_set` and `cmd_get` being mixed in the Memcache module. {pull}5189[5189]
+
 *Packetbeat*
 
 *Winlogbeat*

metricbeat/module/memcached/stats/data.go

@@ -21,8 +21,8 @@ var (
 			"misses": c.Int("get_misses"),
 		},
 		"cmd": s.Object{
-			"get": c.Int("cmd_set"),
-			"set": c.Int("cmd_get"),
+			"get": c.Int("cmd_get"),
+			"set": c.Int("cmd_set"),
 		},
 		"read": s.Object{
 			"bytes": c.Int("bytes_read"),