diff --git a/internal/cmd/cmd.go b/internal/cmd/cmd.go
index e99f8a9..79ce941 100644
--- a/internal/cmd/cmd.go
+++ b/internal/cmd/cmd.go
@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"context"
+	"github.com/loveuer/esgo2dump/log"
 
 	"github.com/loveuer/esgo2dump/internal/opt"
 	"github.com/spf13/cobra"
@@ -48,7 +49,7 @@ esgo2dump --input=http://127.0.0.1:9200/some_index --output=./data.json --query_
 )
 
 func init() {
-	rootCommand.Flags().BoolVar(&opt.Debug, "debug", false, "")
+	rootCommand.PersistentFlags().BoolVar(&opt.Debug, "debug", false, "")
 	rootCommand.Flags().BoolVarP(&f_version, "version", "v", false, "print esgo2dump version")
 	rootCommand.Flags().IntVar(&opt.Timeout, "timeout", 30, "max timeout seconds per operation with limit")
 
@@ -62,6 +63,12 @@ func init() {
 	rootCommand.Flags().StringVarP(&f_query, "query", "q", "", `query dsl, example: {"bool":{"must":[{"term":{"name":{"value":"some_name"}}}],"must_not":[{"range":{"age":{"gte":18,"lt":60}}}]}}`)
 	rootCommand.Flags().StringVar(&f_query_file, "query_file", "", `query json file (will execute line by line)`)
 	rootCommand.Flags().Uint64VarP(&f_limit, "limit", "l", 100, "")
+
+	rootCommand.PersistentPreRun = func(cmd *cobra.Command, args []string) {
+		if opt.Debug {
+			log.SetLogLevel(log.LogLevelDebug)
+		}
+	}
 }
 
 func Start(ctx context.Context) error {
diff --git a/internal/cmd/run.go b/internal/cmd/run.go
index b7ee291..b031449 100644
--- a/internal/cmd/run.go
+++ b/internal/cmd/run.go
@@ -51,10 +51,6 @@ func run(cmd *cobra.Command, args []string) error {
 		ioo interfaces.DumpIO
 	)
 
-	if opt.Debug {
-		log.SetLogLevel(log.LogLevelDebug)
-	}
-
 	if f_version {
 		fmt.Printf("esgo2dump (Version: %s)\n", opt.Version)
 		os.Exit(0)
diff --git a/internal/util/min.go b/internal/util/min.go
index 419eb04..b85dd37 100644
--- a/internal/util/min.go
+++ b/internal/util/min.go
@@ -7,3 +7,15 @@ func Min[T ~string | ~int | ~int64 | ~uint64 | ~float64 | ~float32 | ~int32 | ~u
 
 	return b
 }
+
+func AbsMin(a, b uint64) uint64 {
+	if a == 0 {
+		return b
+	}
+
+	if b == 0 {
+		return a
+	}
+
+	return Min(a, b)
+}
diff --git a/xes/es7/read.go b/xes/es7/read.go
index cdb8013..a60967a 100644
--- a/xes/es7/read.go
+++ b/xes/es7/read.go
@@ -199,11 +199,14 @@ func ReadDataV2(
 			close(errCh)
 		}()
 
+		fina_size := util.AbsMin(size, max-total)
+		log.Debug("es7.read: size = %d, max = %d, total = %d, fina size = %d", size, max, total, fina_size)
+
 		for {
 			qs = []func(*esapi.SearchRequest){
 				client.Search.WithContext(util.TimeoutCtx(ctx, 30)),
 				client.Search.WithIndex(index),
-				client.Search.WithSize(int(util.Min(size, max-total))),
+				client.Search.WithSize(int(fina_size)),
 				client.Search.WithSort(sorts...),
 			}
 
@@ -221,6 +224,8 @@ func ReadDataV2(
 				return
 			}
 
+			log.Debug("body raw: %s", string(bs))
+
 			qs = append(qs, client.Search.WithBody(bytes.NewReader(bs)))
 			if resp, err = client.Search(qs...); err != nil {
 				errCh <- err
@@ -247,6 +252,8 @@ func ReadDataV2(
 			dataCh <- result.Hits.Hits
 			total += uint64(len(result.Hits.Hits))
 
+			log.Debug("es7.read: total: %d", total)
+
 			if uint64(len(result.Hits.Hits)) < size || (max > 0 && total >= max) {
 				break
 			}