Fs gateway snapshots

The problem: The snapshotting only happens when I shut down the node that I
am running and not every 30 secs, as I would expect from the below
configuration. Did I configure something incorrectly or am I not understand
when the snapshots would take place?

The configuration, that I have setup is:

gateway:
type: fs
fs:
location: /Users/sanyal/Documents/workspace/hb_indices/meta
index:
gateway:
type: fs
fs:
location: /Users/sanyal/Documents/workspace/hb_indices/snapshot
snapshot_interval : 30
snapshot_on_close : true
memory:
enabled: true
store:
type: niofs
number_of_shards : 3
number_of_replicas : 2
path:
logs: /Users/sanyal/Documents/workspace/logs

As a background, I am prototyping ES for use in our in-house CMS
application. So right now, ES is setup on only my laptop, which is macbook
with 2.26 Ghz core 2 duo with 4GB RAM. I am also using only one node for
indexing and searching.

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