@Override
    public void readIndex(final byte[] requestContext, final ReadIndexClosure done) {
        readIndex(this.raftOptions.getReadOnlyOptions(), requestContext, done);
    }
Returns the JRaft service factory for current node.
@since 1.2.6
@return the service factory
jraft-core/src/main/java/com/alipay/sofa/jraft/core/NodeImpl.java