Failed to `scip-java index` the openrewrite/rewrite repository

[olafurpg]

$ scip-java index
...
* What went wrong:
Execution failed for task ':clean'.
> java.io.IOException: Unable to delete directory '/Users/olafurpg/dev/openrewrite/rewrite/build'
    Failed to delete some children. This might happen because a process has files open or has its working directory set in the target directory.
    - /Users/olafurpg/dev/openrewrite/rewrite/build/semanticdb-targetroot
    New files were found. This might happen because a process is still writing to the target directory.
    - /Users/olafurpg/dev/openrewrite/rewrite/build/semanticdb-targetroot/dependencies.txt