I had use the solution mentioned by @Vidic Florjan on this link https://answers.atlassian.com/questions/230835
Can this be consider a bug?
It's not a bug. The point of JIRA is tracking stuff, not obscuring things from users. The structure to hide bits of a task (i.e. it's subtasks) simply isn't there. Florjan's workaround is clever, but it's not going to work everywhere because JIRA doesn't want to hide this data - it's very nature is to show the users all the information. I don't think you can work around that design. Still, at least the users can't get the subtask details.
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