Issue with Spring Webclient 5: Executor not accepting a task

I’m running a Spring webflux app which makes http calls to another service. Under high load (atleast this is when I see these errors), http call from webclient 5 to another service fails with java.lang.IllegalStateException: executor not accepting a task .

What could be the reason for this? Here’s my HTTP call implementation.

public Mono<Context> doHttp(WebClient webClient, WBConfig webClientConfiguration, String data, Context ctx) {
     return getWebclient(webClient, webClientConfiguration, data, ctx)
        .headers(httpHeaders -> logHeadersAndPayload(ctx, data, httpHeaders))
        .retrieve()
        .bodyToMono(Object.class)
        .publishOn(SchedulerHelper.getSharedPool())
        .onErrorResume(getErrorHandleFunction(webClientConfiguration, ctx, taskName))
        .retryWhen(buildRetrySpec(webClientConfiguration))
        .flatMap(getResponseToContextMonoFunction(ctx, taskName, startTime));
}

SchedulerHelper class returns the following scheduler with configuration. Please note that this is shared app wise. This is created when the app boots up.

Schedulers.newBoundedElastic(100, Integer.MAX_VALUE, new ThreadFactoryBuilder().setNameFormat("http-threads").build(), 60)

I do not get any other information in the stack trace exception thatI have posted this on SO as well. @simonbasle anything that we need to configure?