Missing index pattern

I am trying to fetch the index in a specific dashboard however the index pattern goes missing
For an Example:- In discover i can see 10 pattern but in dashboard in add filter section only limited index patterns are visible, even if i search the index pattern it does not come up
Could you please tell me if there are any exceptions

Hi @Ayushi_bhardwaj

What permissions does your user have in Kibana? Do you have administrative access, or are you using a user with limited permissions?