Elasticsearch Couchbase XDCR error

I'm having an issue creating a XDCR to Elasticsearch.

I'm getting the following error on Couchbase:
xdcr_errors.log

[xdcr:error,2014-11-04T13:23:14.796,ns_1@couchbase002:<0.8335.2272>:xdc_vbucket_rep:terminate:489]Replication
(CAPI mode)434c41fc737b38b9a374a08085553abf/adepteo/adepteo ( adepteo/620 ->
http://@172.16.2.169:9091/adepteo%2f620 ) failed:
{http_request_failed,"POST",
"http://adepteo:
@172 .16.2.169:9091/adepteo%2f620/_revs_diff",
{error,{code,503}}}

couchdb.log

[couchdb:info,2014-11-04T13:04:05.135,ns_1@couchbase002:<0.2898.2275>:couch_log:info:41]Retrying
POST request to http://adepteo:*****@172 http://adepteo:*****@0.0.0.172/
.
16.2.169:9091/adepteo%2f461/_revs_diff in 0.5 seconds due to error
{code,503}

Couchbase bucket has about 133K items in it, Elastic search gets about 90K.
These errors seem to repeat a fill up the logs rapidly. No errors log on
Elastic search machine.

I am using a custom ES template.

Any help is much appreciated.

Thanks,
Mark

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