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diff --git a/fluent-bit/plugins/out_es/es_bulk.h b/fluent-bit/plugins/out_es/es_bulk.h
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+++ b/fluent-bit/plugins/out_es/es_bulk.h
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+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2022 The Fluent Bit Authors
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#ifndef FLB_OUT_ES_BULK_H
+#define FLB_OUT_ES_BULK_H
+
+#include <inttypes.h>
+
+#define ES_BULK_CHUNK      4096  /* Size of buffer chunks    */
+#define ES_BULK_HEADER      165  /* ES Bulk API prefix line  */
+#define ES_BULK_INDEX_FMT    "{\"%s\":{\"_index\":\"%s\",\"_type\":\"%s\"}}\n"
+#define ES_BULK_INDEX_FMT_ID "{\"%s\":{\"_index\":\"%s\",\"_type\":\"%s\",\"_id\":\"%s\"}}\n"
+#define ES_BULK_INDEX_FMT_WITHOUT_TYPE  "{\"%s\":{\"_index\":\"%s\"}}\n"
+#define ES_BULK_INDEX_FMT_ID_WITHOUT_TYPE "{\"%s\":{\"_index\":\"%s\",\"_id\":\"%s\"}}\n"
+#define ES_BULK_UPDATE_OP_BODY "{\"doc\":%s}"
+#define ES_BULK_UPSERT_OP_BODY "{\"doc_as_upsert\":true,\"doc\":%s}"
+
+struct es_bulk {
+    char *ptr;
+    uint32_t len;
+    uint32_t size;
+};
+
+struct es_bulk *es_bulk_create(size_t estimated_size);
+int es_bulk_append(struct es_bulk *bulk, char *index, int i_len,
+                   char *json, size_t j_len,
+                   size_t whole_size, size_t curr_size);
+void es_bulk_destroy(struct es_bulk *bulk);
+
+#endif