Check your Elasticsearch version

The most common problem you can encounter with Couchbase-Elasticsearch integration is that data fails to transfer due to an incompatible Elasticsearch version. Elasticsearch has evolved between versions and Couchbase Plugin for Elasticsearch has been specifically designed a tested for a particular version. If you use a higher version or lower version, it will result in failure to transfer data. If you have an incompatible version of the plug, you might see this message:

Attention - Failed to grab remote bucket info from any of known nodes

And if you check the Elasticsearch head console, you will find a stack trace similar to this:

[2012-12-19 05:50:41,758][WARN ][org.eclipse.jetty.servlet.ServletHandler] Error for /pools/default/buckets 
java.lang.NoSuchMethodError: 
....

If you get this error make sure you are using the plug-in with the correct version of Elasticsearch.

Check destination cluster references

The second most common error that occurs is when you create a cluster reference in Couchbase Web Console then at a later time create and start the replication. After you create a reference to your Elasticsearch cluster, the IP address may change, especially if you are using Elasticsearch on a laptop. In this case you will get this error under XDCR | Ongoing Replications | Status:

Figure 4.2. XDCR Error from Changed IP

To resolve this error, check your remote Elasticsearch reference in XDCR and make sure the IP address is correct.