8927 plugin search (#10489)

* #7016 base search classes

* 7016 add search indexes

* 7016 add search indexes

* 7016 add search indexes

* 7016 add search indexes

* 7016 add search indexes

* 7016 add search indexes

* 8927 refactor search

* 8927 refactor search

* 8927 refactor search

* 8927 refactor search

* 8927 get search choices working

* 8927 cleanup - optimize

* 8927 use backend search function

* 8927 fix for plugin search

* 8927 add docs

* Move search app to a module under netbox/

* Utilize global registry to register model search classes

* Build search form options from registry

* Determine search categories from model app by default

* Enable dynamic search registration for plugins

* Update docs & improve plugin support

* Clean up search backend class

* Docs for #8927

Co-authored-by: jeremystretch <jstretch@ns1.com>

netbox/virtualization/apps.py

@@ -3,3 +3,6 @@ from django.apps import AppConfig
 
 class VirtualizationConfig(AppConfig):
     name = 'virtualization'
+
+    def ready(self):
+        from . import search

netbox/virtualization/search.py

@@ -0,0 +1,33 @@
+import virtualization.filtersets
+import virtualization.tables
+from dcim.models import Device
+from netbox.search import SearchIndex, register_search
+from utilities.utils import count_related
+from virtualization.models import Cluster, VirtualMachine
+
+
+@register_search()
+class ClusterIndex(SearchIndex):
+    model = Cluster
+    queryset = Cluster.objects.prefetch_related('type', 'group').annotate(
+        device_count=count_related(Device, 'cluster'), vm_count=count_related(VirtualMachine, 'cluster')
+    )
+    filterset = virtualization.filtersets.ClusterFilterSet
+    table = virtualization.tables.ClusterTable
+    url = 'virtualization:cluster_list'
+
+
+@register_search()
+class VirtualMachineIndex(SearchIndex):
+    model = VirtualMachine
+    queryset = VirtualMachine.objects.prefetch_related(
+        'cluster',
+        'tenant',
+        'tenant__group',
+        'platform',
+        'primary_ip4',
+        'primary_ip6',
+    )
+    filterset = virtualization.filtersets.VirtualMachineFilterSet
+    table = virtualization.tables.VirtualMachineTable
+    url = 'virtualization:virtualmachine_list'