fix ineffassign

Author: wafuwafu13

.golangci.yml

@@ -3,7 +3,6 @@ linters:
   # TODO remove this rule.
   disable:
     - errcheck
-    - ineffassign
     - staticcheck
 linters-settings:
   govet:

check-elasticsearch/lib/check_elasticsearch.go

@@ -57,7 +57,7 @@ func run(args []string) *checkers.Checker {
 	var health healthStat
 	dec.Decode(&health)
 
-	checkSt := checkers.UNKNOWN
+	var checkSt checkers.Status
 	switch health.Status {
 	case "green":
 		checkSt = checkers.OK