SUMO-0: Add terraform support for searchable time dashboard

Author: charlessumo

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## X.Y.Z (Unreleased)
 * Add new change notes here
+* Add support for searchable time for dashboard field time_source
 
 BUG FIXES:
 * When the email of a sumologic_user is changed, instead of silently doing nothing, an error will be raised to the user

sumologic/resource_sumologic_dashboard.go

@@ -371,7 +371,7 @@ func getSumoSearchPanelQuerySchema() map[string]*schema.Schema {
 			Type:         schema.TypeString,
 			Optional:     true,
 			Default:      "Message",
-			ValidateFunc: validation.StringInSlice([]string{"Message", "Receipt"}, false),
+			ValidateFunc: validation.StringInSlice([]string{"Message", "Receipt", "Searchable"}, false),
 		},
 		"transient": {
 			Type:     schema.TypeBool,