Grails 3 - Dependencies not re-index when added to build.gradle after initial import

Reproduce:
Import new Grails 3.0.10, import as Gradle (Import from existing -> double click build.gradle). Using gradle wrapper and Auto import is set to false (if it's true grails imports/traits do not work)

Let IDEA resolve/index deps. Intellisense works.

Add 1 new dependency to build.gradle, eg `compile 'com.sendgrid:sendgrid-java:2.2.2'`

IDEA indexes, but that dependency is not resolved in intellisense. Any sendgrid imports/object are red.

Work around -
Blow away the IDEA project and re-import the project, leaving the dependency in build.gradle. After the initial index that dependency that wasn't available to intellisense is now working.

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*Imported from [IDEA-149513](https://youtrack.jetbrains.com/issue/IDEA-149513) · Type: Bug · Votes: 5*
*Comments, attachments, dates and reporter are not part of the export — follow the link above for the full history.*

Reproduce the problem with the Grails 3.0.10 project and its build.gradle, using the Gradle wrapper with Auto import disabled. Compare dependency indexing after adding sendgrid-java with indexing after a full project re-import. Done means the added dependency resolves in IntelliJ intellisense without deleting and re-importing the project.

Written by the indexing model from the issue text.