use slices.Collect(maps.Keys()) to get map keys

pkg/es/ilm.go

@@ -22,6 +22,8 @@ import (
 	"errors"
 	"fmt"
 	"log/slog"
+	"maps"
+	"slices"
 	"strings"
 
 	"codeberg.org/scip/esctl/pkg/cfg"
@@ -62,13 +64,7 @@ func IlmNames(conf *cfg.Config) ([]string, error) {
 		return nil, fmt.Errorf("failed to get ilm policies: %w", esErrorString(err))
 	}
 
-	names := make([]string, len(res))
-	idx := 0
-
-	for name := range res {
-		names[idx] = name
-		idx++
-	}
+	names := slices.Collect(maps.Keys(res))
 
 	return names, nil
 }