1.es初始化失败。

----ES 设置密码总是失败。
SSL connection to https://127.0.0.1:9200/_security/_authenticate?pretty failed: No subject alternative names present
Please check the elasticsearch SSL settings under xpack.security.http.ssl.
ERROR: Failed to establish SSL connection to elasticsearch at https://127.0.0.1:9200/_security/_authenticate?pretty. 
--解决方法。

1).设置认证证书
./elasticsearch-certutil ca
./elasticsearch-certutil cert --ca elastic-stack-ca.p12
2).https模式启动ES（初始化）;
vim elasticsearch.yml 
xpack.security.enabled: true
xpack.security.transport.ssl.enabled: true
xpack.security.transport.ssl.verification_mode: certificate
xpack.security.transport.ssl.client_authentication: required
xpack.security.transport.ssl.keystore.path: elastic-certificates.p12
xpack.security.transport.ssl.truststore.path: elastic-certificates.p12
xpack.security.audit.enabled: true
xpack.security.http.ssl.enabled: true
xpack.security.http.ssl.keystore.path: elastic-certificates.p12
xpack.security.http.ssl.truststore.path: elastic-certificates.p12

3).注释如下三个参数并重启ES
vim elasticsearch.yml  
#xpack.security.http.ssl.enabled: true
#xpack.security.http.ssl.keystore.path: elastic-certificates.p12
#xpack.security.http.ssl.truststore.path: elastic-certificates.p12

重启:
kill $(ps -ef | grep elasticsearch | grep java |grep -v yace | awk '{print $2}')
elasticsearch -d 

4).设置密码
elasticsearch-setup-passwords interactive

5).取消注释如下三个参数并重启。
vim elasticsearch.yml  
xpack.security.http.ssl.enabled: true
xpack.security.http.ssl.keystore.path: elastic-certificates.p12
xpack.security.http.ssl.truststore.path: elastic-certificates.p12

重启:
kill $(ps -ef | grep elasticsearch | grep java |grep -v yace | awk '{print $2}')
elasticsearch -d