We are upgrading elasticsearch from 5.3.1 to 6.4.0.
Tomcat application is not able to connect elastic with https URL even after installing per format of cert in JDK cacerts.
Error while application is trying to connect elastic instance is :
org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{QM4k_9t4Ql6yJAtyQ0xZUw}{dc1dvavsintap09.es.ad.adp.com}{51.12.67.67:9200}]
##############################################################
bairyv@dc1dvavsscpap22:~> curl --cacert /tmp/ca.cer https://dc1dvavsintap09.es.ad.adp.com:9200 -u elastic
Working fine.
##############################################################
bairyv@dc1dvavsscpap22:~> curl https://dc1dvavsintap09.es.ad.adp.com:9200 -u elastic
Not working
Enter host password for user 'elastic':
curl: (60) SSL certificate problem: unable to get local issuer certificate
More details here: http://curl.haxx.se/docs/sslcerts.html
curl performs SSL certificate verification by default, using a "bundle"
of Certificate Authority (CA) public keys (CA certs). If the default
bundle file isn't adequate, you can specify an alternate file
using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
the bundle, the certificate verification probably failed due to a
problem with the certificate (it might be expired, or the name might
not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
the -k (or --insecure) option.