413 Request Entity Too Large

Hi, all

I'm using fluentd to collect logs and send them to elasticsearch but facing below issue, how to fix it? Thanks for the help.

Elasticsearch version: 5.4.0 with default elasticsearch.yml

error log from fluentd:

2017-06-30 21:42:32 +0800 [warn]: temporarily failed to flush the buffer. next_retry=2017-06-30 21:47:32 +0800 error_class="Elasticsearch::Transport::Transport::Errors::RequestEntityTooLarge" error="[413] <html>\r\n<head><title>413 Request Entity Too Large</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>413 Request Entity Too Large</h1></center>\r\n<hr><center>nginx/1.12.0</center>\r\n</body>\r\n</html>\r\n" plugin_id="object:3fb0497ca950"

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