Convert from Flux to Mono

Instead of take(1), you could use next().

This will transform the Flux into a valued Mono by taking the first emitted item, or an empty Mono if the Flux is empty itself.

Here is a list:

• Flux#single will work if there is one element from Flux. Eg: flux.take(1).single();

• Flux#next will get you the first element. Eg: flux.next();

• Flux#last for last element. Eg: flux.last();

• Flux#singleOrEmpty is similar to Optional. Eg: flux.take(0).singleOrEmpty();

• Flux#collect, it depends on use case.

    flux.collect(Collectors.reducing((i1, i2) -> i1))
        .map(op -> op.get());
  

• Flux#elementAt for i'th index. Eg: flux.elementAt(1);

• Flux#shareNext for first found element. flux.shareNext();

• Flux#reduce for reduction op. Eg: flux.reduce((i1,i2) -> i1);

Or,you could use single() on the filtered Flux