The eDiscovery interface is available to all users from the self service portal and the Admin Panel. However the data visible in the eDiscovery application depends on two factors.
1. Whether the user’s data is indexed. This is decided depending on the Plan
2. The list of user’s whose indexed data is visible to a user.
A user assigned a senior admin role can control the access to the indexed data.
Refer the link to know how you can configure eDiscovery view for users.