[FEATURE] Elasticsearch 自签证书问题

[YuJunping]

SQLBot version
1.7.0
Please describe your requirements or suggestions for improvement
Elasticsearch 使用自签证书，或取数据失败。没有地方可以设置忽略证书校验。
Preview Failed: ("HTTPSConnectionPool(host='172.16.x.x', port=9200): Max retries exceeded with url: /_sql?format=json (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1016)')))",)