`indexer-security-init.sh` script sets unsecure defaullt credentials

[gdiazlo]

Wazuh version	Install type	Action performed	Platform
4.3.4	-	Install	-

Following the documentation for an offline installation we ask the user to use indexer-security-init.sh to initialize the wazuh-indexer. This script set the default credentials to admin:admin. At least the password should be randomly generated.