Don't add unserializable fields to jolokia2 input (#4930)

plugins/inputs/jolokia2/point_builder.go

@@ -158,8 +158,11 @@ func (pb *pointBuilder) fillFields(name string, value interface{}, fieldMap map[
 	if valueMap, ok := value.(map[string]interface{}); ok {
 		// keep going until we get to something that is not a map
 		for key, innerValue := range valueMap {
-			var innerName string
+			if _, ok := innerValue.([]interface{}); ok {
+				continue
+			}
 
+			var innerName string
 			if name == "" {
 				innerName = pb.metric.FieldPrefix + key
 			} else {
@@ -172,6 +175,10 @@ func (pb *pointBuilder) fillFields(name string, value interface{}, fieldMap map[
 		return
 	}
 
+	if _, ok := value.([]interface{}); ok {
+		return
+	}
+
 	if pb.metric.FieldName != "" {
 		name = pb.metric.FieldName
 		if prefix := pb.metric.FieldPrefix; prefix != "" {