Seemingly unused or inconsistent data in meta.json

[Umaaz]

Describe the bug
When reviewing the meta.json for the blocks there are some data points that seem to be unused or inconsistent.

• totalObjects vs totalRecords - objects are the number of snapshots in the block, records always seems to be 1. They are then referred to inconsistently in the code in compactor.go#60 for example.
• indexPageSize - seems to be passed around during requests but never set or read
• encoding and dataEncoding - should be reviewed to ensure these are correct

Expected behavior
Naming and usage should be consistent and clear.