Filebeat unable send MariaDB slowlogs data to kibana

Dear Team,
We are used Filebeat 6.4.2 version.
Filebeat sending many logs to kibana like Tomcat, MariaDB error, Apache, etc, but If I add a path to MariaDB slowlog, after kibana is not loaded data and Filebeat through errors:

2020-02-05T16:08:25.787+0530	INFO	template/load.go:129	Template already exists and will not be overwritten.
2020-02-05T16:08:25.787+0530	INFO	pipeline/output.go:105	Connection to backoff(elasticsearch( established
2020-02-05T16:08:25.787+0530	INFO	[publish]	pipeline/retry.go:189	retryer: send unwait-signal to consumer
2020-02-05T16:08:25.787+0530	INFO	[publish]	pipeline/retry.go:191	  done
2020-02-05T16:08:25.793+0530	ERROR	elasticsearch/client.go:317	Failed to perform any bulk index operations: 413 Request Entity Too Large: <html>
<head><title>413 Request Entity Too Large</title></head>
<body bgcolor="white">
<center><h1>413 Request Entity Too Large</h1></center>
<hr><center>nginx/1.10.3 (Ubuntu)</center>

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