Solr settings link to multisite network URL, but plugin is not network active

[bamadesigner]

We are using the plugin on a multisite network, but the plugin is not network active because on some sites we don't want or need Solr search. But when you click the "Settings" page on the single site's Plugins screen where the plugin is active, its sending you to a URL that lives inside the network admin. But the plugin isnt network active so the settings page doesn't work in our network admin.

[jazzsequence]

The plugin does not currently support single-site-only installs on a WordPress multisite. #544 addresses this by disallowing the plugin from being activated in a single site. Additional refactoring would likely need to be done to truly allow individual sites to opt-in/-out, so I'm leaving this issue open so we can come back to it.