Failed to start Filebeat sends log files to Logstash or directly to Elasticsearch

Thanks for your pateince and support. You have really helped me a lot!

I followed all the steps mentioned in the quick start document. After that I'm getting this error-

2021-06-17T11:19:36.574-0700	INFO	template/load.go:123	template with name 'filebeat-7.13.2' loaded.
2021-06-17T11:19:36.574-0700	INFO	[index-management]	idxmgmt/std.go:297	Loaded index template.
2021-06-17T11:19:36.574-0700	DEBUG	[esclientleg]	eslegclient/connection.go:364	GET http://3.143.72.87:9200/_alias/filebeat-7.13.2  <nil>
2021-06-17T11:19:36.659-0700	INFO	[index-management.ilm]	ilm/std.go:121	Index Alias filebeat-7.13.2 exists already.
Index setup finished.
Loading dashboards (Kibana must be running and reachable)
2021-06-17T11:19:36.659-0700	INFO	kibana/client.go:119	Kibana url: http://3.143.72.87:5601
2021-06-17T11:19:40.243-0700	INFO	kibana/client.go:119	Kibana url: http://3.143.72.87:5601
2021-06-17T11:19:40.986-0700	DEBUG	[dashboards]	dashboards/kibana_loader.go:156	Initialize the Kibana 7.9.2 loader
2021-06-17T11:19:40.986-0700	DEBUG	[dashboards]	dashboards/kibana_loader.go:156	Kibana URL http://3.143.72.87:5601
2021-06-17T11:19:41.919-0700	ERROR	instance/beat.go:989	Exiting: 1 error: error loading index pattern: returned 413 to import file: <nil>. Response: {"statusCode":413,"error":"Request Entity Too Large","message":"Payload content length greater than maximum allowed: 1048576"}
Exiting: 1 error: error loading index pattern: returned 413 to import file: <nil>. Response: {"statusCode":413,"error":"Request Entity Too Large","message":"Payload content length greater than maximum allowed: 1048576"}

Also- on my Kibana UI- under index management- an index with name filebeat filebeat-7.13.2-2021.06.18-000001 is created. When I create an index pattern for this manually as filebeat-*, and under Discover I see this index- it shows me the logs of previously loaded file and not the actual logs. And my Kibana dashboard hangs/freezes for sometime as well.

Please help me. Thanks