Weird logs in influxdb

influxdb
#1

Hello!
we recently switched to influxdb 1.4.2 ( official docker image)
And now log is full of messages like:

[E] 2017-12-01T09:07:58Z IntegerIterator finalized by GC engine=tsm1
[E] 2017-12-01T09:07:58Z IntegerIterator finalized by GC engine=tsm1
[E] 2017-12-01T09:07:59Z IntegerIterator finalized by GC engine=tsm1
[E] 2017-12-01T09:07:59Z IntegerIterator finalized by GC engine=tsm1
[E] 2017-12-01T09:07:59Z IntegerIterator finalized by GC engine=tsm1

What causes this logs and should i even bother?