Just got this too after latest MT5 update, still can't find anything about it.
This might help:

Новая версия платформы MetaTrader 4 build 1170
- 2019.08.23
- www.mql5.com
Новая версия платформы MetaTrader 4 build 1170 20 декабря 2018 года будет выпущено обновление MetaTrader 4...
Looks like then PositionsTotal() and IndicatorRelease() are hidden methods and we should call them CClassDefinesMethod::PositionsTotal()
and CClassDefinesMethod::IndicatorRelease(). That makes me other question then. In what classes are PositionsTotal() and
IndicatorRelease() definded?

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I'd like to compile my code without warnings but the complier give me this warnings:
It looks like PositionsTotal() and IndicatorRelease are depracted?