Parsing date and forwarding to Elastic

I have basicly the same problem mentionned in this topic :
I have this log format :

2019-04-19 12:00:05.225 FCC7-VCS01-B VCS: [0x00000e9c] Internal H.323 Stack is alive.

i need to parse that date format, according to the topic below, @magnusbaeck suggested that

why the date filter fails. It could be that the ISO8601 pattern doesn't match "2017-04-26 09:40:33" (because you have no "T" between the date and the time). A more exact pattern (similar to the second pattern you've listed) will definitely work

I would like to know how exactly could i get that more exact pattern
Any suggestions will be apperciated .

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