Add step for creating search index

docs/development/adding-models.md

@@ -54,15 +54,19 @@ Each model should have a corresponding FilterSet class defined. This is used to
 
 Create a table class for the model in `tables.py` by subclassing `utilities.tables.BaseTable`. Under the table's `Meta` class, be sure to list both the fields and default columns.
 
-## 9. Create the object template
+## 9. Create a SearchIndex subclass
+
+If this model will be included in global search results, create a subclass of `netbox.search.SearchIndex` for it and specify the fields to be indexed.
+
+## 10. Create the object template
 
 Create the HTML template for the object view. (The other views each typically employ a generic template.) This template should extend `generic/object.html`.
 
-## 10. Add the model to the navigation menu
+## 11. Add the model to the navigation menu
 
 Add the relevant navigation menu items in `netbox/netbox/navigation/menu.py`.
 
-## 11. REST API components
+## 12. REST API components
 
 Create the following for each model:
 
@@ -71,13 +75,13 @@ Create the following for each model:
 * API view in `api/views.py`
 * Endpoint route in `api/urls.py`
 
-## 12. GraphQL API components
+## 13. GraphQL API components
 
 Create a Graphene object type for the model in `graphql/types.py` by subclassing the appropriate class from `netbox.graphql.types`.
 
 Also extend the schema class defined in `graphql/schema.py` with the individual object and object list fields per the established convention.
 
-## 13. Add tests
+## 14. Add tests
 
 Add tests for the following:
 
@@ -85,7 +89,7 @@ Add tests for the following:
 * API views
 * Filter sets
 
-## 14. Documentation
+## 15. Documentation
 
 Create a new documentation page for the model in `docs/models/<app_label>/<model_name>.md`. Include this file under the "features" documentation where appropriate.