diff --git a/elasticsearch/bulk/bulk.go b/elasticsearch/bulk/bulk.go
index 260c387..e202bf4 100644
--- a/elasticsearch/bulk/bulk.go
+++ b/elasticsearch/bulk/bulk.go
@@ -55,7 +55,7 @@ type Metric struct {
 }
 
 type BatchItem struct {
-	Bytes  []byte
+	Bytes  *bytes.Buffer
 	Action *document.ESActionDocument
 }
 
@@ -145,7 +145,7 @@ func (b *Bulk) AddActions(
 
 		key := getActionKey(action)
 		if batchIndex, ok := b.batchKeys[key]; ok {
-			b.batchByteSize += len(value) - len(b.batch[batchIndex].Bytes)
+			b.batchByteSize += value.Len() - b.batch[batchIndex].Bytes.Len()
 			b.batch[batchIndex] = BatchItem{
 				Action: &actions[i],
 				Bytes:  value,
@@ -158,7 +158,7 @@ func (b *Bulk) AddActions(
 			b.batchKeys[key] = b.batchIndex
 			b.batchIndex++
 			b.batchSize++
-			b.batchByteSize += len(value)
+			b.batchByteSize += value.Len()
 		}
 	}
 	ctx.Ack()
@@ -182,35 +182,43 @@ var (
 
 var metaPool = sync.Pool{
 	New: func() interface{} {
-		return []byte{}
+		return &bytes.Buffer{}
 	},
 }
 
-func getEsActionJSON(docID []byte, action document.EsAction, indexName string, routing *string, source []byte, typeName []byte) []byte {
-	meta := metaPool.Get().([]byte)[:0]
+func getEsActionJSON(
+	docID []byte,
+	action document.EsAction,
+	indexName string,
+	routing *string,
+	source []byte,
+	typeName []byte,
+) *bytes.Buffer {
+	meta := metaPool.Get().(*bytes.Buffer)
+	meta.Reset()
 
 	if action == document.Index {
-		meta = append(meta, indexPrefix...)
+		meta.Write(indexPrefix)
 	} else {
-		meta = append(meta, deletePrefix...)
+		meta.Write(deletePrefix)
 	}
-	meta = append(meta, helper.Byte(indexName)...)
-	meta = append(meta, idPrefix...)
-	meta = append(meta, helper.EscapePredefinedBytes(docID)...)
+	meta.Write(helper.Byte(indexName))
+	meta.Write(idPrefix)
+	meta.Write(helper.EscapePredefinedBytes(docID))
 	if routing != nil {
-		meta = append(meta, routingPrefix...)
-		meta = append(meta, helper.Byte(*routing)...)
+		meta.Write(routingPrefix)
+		meta.Write(helper.Byte(*routing))
 	}
 	if typeName != nil {
-		meta = append(meta, typePrefix...)
-		meta = append(meta, typeName...)
+		meta.Write(typePrefix)
+		meta.Write(typeName)
 	}
-	meta = append(meta, postFix...)
+	meta.Write(postFix)
 	if action == document.Index {
-		meta = append(meta, '\n')
-		meta = append(meta, source...)
+		meta.WriteByte('\n')
+		meta.Write(source)
 	}
-	meta = append(meta, '\n')
+	meta.WriteByte('\n')
 	return meta
 }
 
@@ -233,7 +241,6 @@ func (b *Bulk) flushMessages() {
 		}
 		b.batchTicker.Reset(b.batchTickerDuration)
 		for _, batch := range b.batch {
-			//nolint:staticcheck
 			metaPool.Put(batch.Bytes)
 		}
 		b.batch = b.batch[:0]
@@ -387,7 +394,7 @@ func getActionKey(action document.ESActionDocument) string {
 func getBytes(batchItems []BatchItem) [][]byte {
 	var batchBytes [][]byte
 	for _, batchItem := range batchItems {
-		batchBytes = append(batchBytes, batchItem.Bytes)
+		batchBytes = append(batchBytes, batchItem.Bytes.Bytes())
 	}
 	return batchBytes
 }