Release v6.1.2

Release v5.6.6

Doc Version bump to 6.1.1 (Do not commit before 6/19)

Fixes elastic#8857

LIR: merge arrays of divergent types

Specifically this change explictly checks for the Array type to merge into and pushes into the array instead of relying only on the + concat.

Fixes elastic#8827

Fixes elastic#8831

Bump gemspecs for 5.6.5

Fixes elastic#8779

fix queue open bug for fully acked in-between pages plus new test

elastic#8596 retry until Vagrant ssh bootstrapping finishes

Fixes elastic#8615

Release notes + docs bump for 5.6.4

Fixes elastic#8595

fix broken links in docs (elastic#8542)

PERFORMANCE: filter_func can optionally take an array of events to ma…

…ke batched filters much faster

Fixes elastic#8428

Fixes elastic#8444

Fixes elastic#8445