I have successfully finished this, so I will close this off as "solved".
Here is a summary of things I did.
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Copied and edited files to:
/etc/init.d/elasticsearch1
/etc/init.d/elasticsearch2
/etc/sysconfig/elasticsearch1
/etc/sysconfig/elasticsearch2
/etc/elasticseach1/config1/elasticsearch.yml
/etc/elasticseach1/config2/elasticsearch.yml -
To start and stop the instances, I use "service elasticsearch1 start" etc
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I split my 12 disks per node between the two instances, 6 disks/pathsfor each instance
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As I have two ethernet adapters I assigned on unique IP to each instance
All working nicely and I am bulk loading in the 12,000 - 15,000/s region, being bound by the I/O on the spinning disks. Its steady and useable so I am happy.