SSL certificate problem

[lxiaofei]

when i use code:

in psql

create index abc_zombodb_index
on abc using zombodb((abc.*))
with (url='https://user:password@host:9243/');
have error,
[Err] ERROR: libcurl error-code: Peer certificate cannot be authenticated with given CA certificates(60); message: SSL certificate problem: self signed certificate in certificate chain; req=-XDELETE https://user:password@host:9243/(null)

how to config the ca certificate part?
es side i use search guard 6,