Remove batch name from remaining archive methods

[btjanaka]

Description

Continuation of #422. Note that I still use measures_batch and other batch names inside of methods themselves when it is necessary to have clarity.

TODO

• [x] Rename measures_batch to measures in index_of
• [x] Rename measures_batch to measures in retrieve

Questions

Status

• [x] I have read the guidelines in CONTRIBUTING.md
• [x] I have formatted my code using yapf
• [x] I have tested my code by running pytest
• [x] I have linted my code with pylint
• [x] I have added a one-line description of my change to the changelog in HISTORY.md
• [x] This PR is ready to go