If we have following observer:

.observe(request().uri().contains("__richfacesPushAsync").index(1))

we want observe first request matching criteria - (URI containing given string), however that is not what happens:

the index(1) calls method addFilter which allows chaining, but this chain evaluates the newly passed filter before it evaluates previous one.

Reverse the order of evaluation in order to fix semantics of fluent API.