adopt latest golang enhancements (#91)

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
 }
@@ -351,7 +347,7 @@ func IlmCreate(conf *cfg.Config, policyname string) error {
 
 		var actions types.IlmActionsVariant = esdsl.NewIlmActions()
 
-		rollover := &types.RolloverAction{}
+		rollover := new(types.RolloverAction{})
 		haveroll := false
 
 		if policy != nil {
@@ -513,8 +509,8 @@ func IlmCreate(conf *cfg.Config, policyname string) error {
 		phases.PhasesCaster().Delete = policy.Phases.Delete
 	}
 
-	put := &putlifecycle.Request{}
-	newpolicy := &types.IlmPolicy{}
+	put := new(putlifecycle.Request{})
+	newpolicy := new(types.IlmPolicy{})
 	newpolicy.IlmPolicyCaster().Phases = *phases.PhasesCaster()
 	put.Policy = newpolicy