@Override
        public void run(final Timeout timeout) throws Exception {
            if (!STATE_UPDATER.compareAndSet(this.closure, PENDING, TIMEOUT)) {
                return;
            }

            final Status status = new Status(RaftError.ETIMEDOUT, "read-index request timeout");
            try {
                this.closure.run(status, INVALID_LOG_INDEX, null);
            } catch (final Throwable t) {
                LOG.error("[Timeout] fail to run ReadIndexClosure with status: {}.", status, t);
            }
        }
Returns the request context.

@return the request context.
jraft-core/src/main/java/com/alipay/sofa/jraft/closure/ReadIndexClosure.java