Developer Curb Appeal: Consider bringing up Solr in Cloud mode by default, or enable it with a single switch, or other system trivial setting

There's some talk that the days of single node search is dead. I don't quite agree, but many people are doing multinode deployments, and other engines are assuming distributed search by default.

Should we consider giving Solr this ability? Perhaps in 5.0?

Or at a minimum, have some other single switch or system setting or separate jar that causes Solr to do all of it's magic Zookeeper stuff by default.

I've logged some other JIRA items to take care of some of the other things that you currently need to specify when starting up 4.1. Until reasonable defaults can be worked out, this auto-cloud mode wouldn't make as much sense.

Is there any harm in bringing up Solr with ZK even if you're only working on a single machine? (assuming all the defaults are taken care of)

Or perhaps there would be some switches, effectively:

• -cloud = assume cloud mode
• -dev_cloud = turn on multicast, autoport selection
• -laptop_cloud = assume we're doing cloud, autoports, etc, except limit it to localhost

I realize there's a lot of technical details here, but the current Solr startup syntax and directories overhead makes it less appealing.