IncrementalWebSession processor should bulk webevents in a monthly index

[jerome73]

Expected behavior and actual behavior.

The IncrementalWebSession processor should putbulk webevents in the ES index suffixed by the month ('yyyy.MM') instead of the day date ('yyyy.MM.dd') of the h2ktimestamp.
Therefore it could target one or a set of months depending on the h2ktimestamp of the collection of records processed.

Problem:
Today the IncrementalWebSession processor putbulks webevents in an ES index suffixed by the day date 'yyyy.MM.dd'. Pb may be in case of a rewind, happening at the beginning of a month it is possible to regenerate indexes (using day date) over the last month period of time.

Steps to reproduce the problem.

Specifications like the version of the project, operating system, or hardware.