Export data is empty when the --c parameter is not used

[kerven88]

Export data is empty when the --c parameter is not used，log display: "total_raw_bytes: 0.00 MB"。

My export command：
[root@ip~]# /opt/esdump export \

--es http://127.0.0.1:9200 \
--index forseti-r-20211118 \
--gzip=false \
--o /tmp/tmp.json \
--MatchBody '{"range": {"activity.S_T_VD_EVENTOCCURDATE.raw": {"gte": "2021-11-18", "lt": "2021-11-19"}}}'

2021/11/19 06:10:16 execute export
2021/11/19 06:10:16 export index forseti-r-20211118 to /tmp/tmp.json
2021/11/19 06:10:16 init elasticsearch Client with url: http://127.0.0.1:9200
2021/11/19 06:10:16 export match: {"range": {"activity.S_T_VD_EVENTOCCURDATE.raw": {"gte": "2021-11-18", "lt": "2021-11-19"}}}
2021/11/19 06:10:16 total exported 1 items; total_raw_bytes: 0.00 MB;
2021/11/19 06:10:16 export time spend 107.544834ms

When there is data after adding the --c parameter, and the amount of exported data varies with the size of the parameter, what is the function of the --c parameter?

[wxf4150]

-c parameter set the max amount of documents to be exported; default(0) will exported all matched document;

pre-commit,the MaxDocs parameter( -c parameter) ,with default(0) vlaue will export none data. it's a bug
i have fix the bug .

@kerven88