Return task object after ms_index!

[mech]

Description

I wish that indexing can return task object so I can get back the taskUid and perform lookup to see if indexing succeeded or not

Basic example

c = Company.first
task = c.ms_index!

task_id = task["taskUid"]

# Later I can check
MeiliSearch::Rails.client.task(task_id)

Currently if indexing failed for whatever reason, it could be misconfiguration, it is hard to tell.

[brunoocasali]

Good idea @mech 👍