Add note for FF search in Searchable Properties page for Issues.mdx (#12777)

* Add note for FF search in Searchable Properties page for Issues.mdx

* add FF to table.mdx

* Update docs/concepts/search/searchable-properties/issues.mdx

Co-authored-by: Ryan Albrecht <[email protected]>

* Update docs/concepts/search/searchable-properties/issues.mdx

Co-authored-by: Billy Vong <[email protected]>

---------

Co-authored-by: Ryan Albrecht <[email protected]>
Co-authored-by: Billy Vong <[email protected]>

Author: 3 people

docs/concepts/search/searchable-properties/issues.mdx

@@ -4,7 +4,7 @@ description: "Learn more about searchable issue properties."
 sidebar_order: 10
 ---
 
-[Issues](/product/issues/) are an aggregate of one or more error events. Searchable issues properties include status, assignment, aggregate counts, and age. You can search by issue properties in the **Issues** page and in **Dashboards** in the widget builder, depending on your dataset selection.
+[Issues](/product/issues/) are an aggregate of one or more error events. Searchable issues properties include status, assignment, aggregate counts, and age. If you have set up [evaluation tracking for feature flags](/product/issues/issue-details/feature-flags/#evaluation-tracking), you can search for issues that have error events where the feature flag evaluated value is `true` or `false`. You can search by issue properties in the **Issues** page and in **Dashboards** in the widget builder, depending on your dataset selection.
 
 ## Searchable Properties
 
@@ -178,6 +178,12 @@ Returns issues with a matching first time seen. Syntax is the same as `age`.
 
 - **Type:** datetime
 
+### `flags`
+
+For [feature flag evaluations](/product/issues/issue-details/feature-flags/#evaluation-tracking) set to `true` or `false`, the name of the feature flag.
+
+- **Type:** boolean
+
 ### `geo.city`
 
 Full name of the city