Ah yes I was discovering/writing this when you wrote that reply. I found this topic (which I just realized you authored 
) which stated that this error came from the fact that I was using a .p12 ca cert instead of a .pem version. As per your instructions, I used openssl pkcs12 -in ca.p12 -clcerts -nokeys -chain -out ca.pem to convert it, but when I started it all back up the logstash logs said
[2019-07-22T13:40:40,822][WARN ][logstash.outputs.elasticsearch] Attempted to resurrect connection to dead ES instance, but got an error. {:url=>"https://127.0.0.1:9200/", :error_type=>LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError, :error=>"Got response code '401' contacting Elasticsearch at URL 'https://127.0.0.1:9200/'"}
I added basic authentication which I had configured on elasticsearch before, and then elastic started giving me this:
[2019-07-22T13:43:15,219][WARN ][o.e.h.n.Netty4HttpServerTransport] [AJMHkPE] caught exception while handling client http traffic, closing connection [id: 0x752c2c77, L:0.0.0.0/0.0.0.0:9200 ! R:/127.0.0.1:39798]
io.netty.handler.codec.DecoderException: io.netty.handler.ssl.NotSslRecordException: not an SSL/TLS record: 48454144202f20485454502f312e310d0a417574686f72697a6174696f6e3a2042617369632061326c69595735684f6c4268637a56334d484a6b49513d3d0d0a486f73743a206c6f63616c686f73743a393230300d0a436f6e74656e742d4c656e6774683a20300d0a436f6e6e656374696f6e3a206b6565702d616c6976650d0a0d0a
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:472) ~[netty-codec-4.1.32.Final.jar:4.1.32.Final]
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:278) ~[netty-codec-4.1.32.Final.jar:4.1.32.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-transport-4.1.32.Final.jar:4.1.32.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-transport-4.1.32.Final.jar:4.1.32.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-transport-4.1.32.Final.jar:4.1.32.Final]
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) [netty-transport-4.1.32.Final.jar:4.1.32.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-transport-4.1.32.Final.jar:4.1.32.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-transport-4.1.32.Final.jar:4.1.32.Final]
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) [netty-transport-4.1.32.Final.jar:4.1.32.Final]
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) [netty-transport-4.1.32.Final.jar:4.1.32.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:656) [netty-transport-4.1.32.Final.jar:4.1.32.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:556) [netty-transport-4.1.32.Final.jar:4.1.32.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:510) [netty-transport-4.1.32.Final.jar:4.1.32.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:470) [netty-transport-4.1.32.Final.jar:4.1.32.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:909) [netty-common-4.1.32.Final.jar:4.1.32.Final]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
*logstash of course was complaining about elasticsearch failing to respond