Add full list of index files to index log entry

[pirz]

Describe the issue

Currently, as part of index metadata we store the root path of index files which the path to the directory containing index files in index log entry. Check here.

We need to change it and store full list of all index files in the Metadata.

To Reproduce

N/A

Expected behavior

Upon successful creation of a covering index, index metadata should contain a full list of index files under content in the corresponding index log entry.

Environment

All environments.