The root paths captured in index log entry should always be absolute paths

[imback82]

Describe the issue

The root path for the index is sometimes recorded as a relative path:

"content" : {
    "root" : "src/test/resources/e2eTests/indexLocation/leftIndex/v__=0",
    "directories" : [ ]
  },

This needs to be fixed to always contain absolute paths (or URIs).

To Reproduce

Run any e2e tests and look at the generated index metadata.

Expected behavior

root should be a absolute path.