Fscrawler version and minimum index compatibility

I used fscrawler 2.7 to index my pdf files.
I've just noticed this on 'localhost:9200' "minimum index compatibility version" : "6.0.0-betal" (see below)
At what 'index compatibility version' will I need to re-index my files with the next version of fscrawler?
Do you have an estimate of when this is likely to be?
Thus year, next year . . . ?

"name" : “volumel",
"clustername" : "elasticsearch",
"cluster uuid" : "PquV G4uR4-xsp-w0507BQ",
"version" :{
"number" : "7.7.1",
"build flavor" : "default",
“buildtype" : "deb”,
"build hash" : "ad56dce891c901a492bblee393fl2dfff473a423”,
"build date" : "2020-05-28T16:30:01.040088Z",
"build snapshot" : false,
“lucene version" : "8.5.1",
"minimum wirecompatibilityversion" : "6.8.0",
"minimum index compatibility version" : "6.0.0-betal"
"tagline" : "You Know, for Search"

The elasticsearch version you are is compatible with FSCrawler 2.7 SNAPSHOT.

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