Description of http_backend_excon_nonblock: - If http_backend_excon_nonblock is true, Farday create Excon instance with nonblocking option which perform http request in nonblocking fassion - If http_backend_excon_nonblock is false, Fardday create Excon instance with blocking option which perform http request in blocking fassion Special Note about http_backend_excon_nonblock: If user use jRuby, you need to consider to configure http_backend_excon_nonblock=false. Since you may experince some issue. - excon/excon#106 - jruby/jruby-ossl#19 But if user is not using jRuby, you'd better to configure http_backend_excon_nonblock=true to prvent fluent-plugine-elasticsearch from stucking Background: The older version of v1.0.0(latest as of 23 March 2020) in Fardday(https://github.com/lostisland/farada), When we use excon(https://github.com/excon/excon) as a adapter for https, Faraday force to configure Excon to disable nonblock due to following jRuby specific problem - excon/excon#106 - jruby/jruby-ossl#19 That's why currently when fluent-plugin-elasticsearch plugin connect to Elastic Search, If it use http, Farday generate Excon instance with nonblocking=true(default of Excon), but in the case of https, Farady generate Excon instance with nonblocking=falase This actually cause the problem making Farday HTTP Client stuck when SSL Server(Elastic Search in current context) stuck during SSL Handshake since Excon SSLSocket can not respecting to timeout, and rely on timeout of SSL::SSLSocket in Ruby Standard Library which have exaclty process-hang problem. That's why sometimes flusth_thread of fluent-plugin-elasticsearch got stuck when Elastic Search had something problem during SSL Session handling. Root cause of this problem is actually implementation of SSL::SSLSocket in Ruby Standard Library(https://redmine.ruby-lang.org/issues/15729), so better to fix Ruby side but it will take a time, and require ruby version up, so better to provide the way to perform workaround.

undefined method `write_nonblock' for OpenSSL::SSL::SSLSocket #19

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