go fix'd

pkg/es/index_template.go

@@ -22,6 +22,7 @@ import (
 	"errors"
 	"fmt"
 	"log/slog"
+	"maps"
 	"strconv"
 	"strings"
 
@@ -448,9 +449,7 @@ func modMappings(mappings []string) (types.TypeMappingVariant, error) {
 func modMeta(conf *cfg.Config, meta types.Metadata) (map[string]json.RawMessage, error) {
 	metadata := map[string]json.RawMessage{}
 
-	for key, value := range meta {
-		metadata[key] = value
-	}
+	maps.Copy(metadata, meta)
 
 	for _, meta := range conf.Meta {
 		parts := strings.Split(meta, ":")