An unknown error occurred while trying to perform a search. URGENT

[David Malmström]

Today we are not able to see any issues in jira, all searches and filters show an error.
An unknown error occurred while trying to perform a search.

This is blocking all of our work with Jira.
Is this a known issue? 

[Thomas Schlegel]

Hi David,

do you use the Cloud version or self hosted Jira? 

In urgent error cases, please contact Atlassian support directly. This is a user based community, where Atlassians do also read and write, but it is not the first level support.

Here you find the support: https://support.atlassian.com/contact/