title: Fail to install Couchbase plugin for ElasticSearch
body: <p>I have CouchBase 2.5.0 enterprise installed with Elasticsearch 1.0.1. 
  I want to install Couchbase plugin on Elasticsearch according to the instructions on <a href="http://www.couchbase.com/couchbase-server/connectors/elasticsearch" rel="nofollow">http://www.couchbase.com/couchbase-server/connectors/elasticsearch</a>, but it fails.</p>
  
  <p>This is the error I get:</p>
  
  <blockquote>
    <p>Installing <code>couchbaselabs/elasticsearch-transport-couchbase/1.2.0-dp</code>...</p>
    
    <p>Trying <a href="http://download.elasticsearch.org/couchbaselabs/elasticsearch-transport-couchbase/elasticsearch-transport-couchbase-1.2.0-dp.zip" rel="nofollow">http://download.elasticsearch.org/couchbaselabs/elasticsearch-transport-couchbase/elasticsearch-transport-couchbase-1.2.0-dp.zip</a>...</p>
    
    <p>Trying <a href="http://search.maven.org/remotecontent?filepath=couchbaselabs/elasticsearch-transport-couchbase/1.2.0-dp/elasticsearch-transport-couchbase-1.2.0-dp.zip" rel="nofollow">http://search.maven.org/remotecontent?filepath=couchbaselabs/elasticsearch-transport-couchbase/1.2.0-dp/elasticsearch-transport-couchbase-1.2.0-dp.zip</a>...</p>
    
    <p>Trying <a href="https://oss.sonatype.org/service/local/repositories/releases/content/couchbaselabs/elasticsearch-transport-couchbase/1.2.0-dp/elasticsearch-transport-couchbase-1.2.0-dp.zip" rel="nofollow">https://oss.sonatype.org/service/local/repositories/releases/content/couchbaselabs/elasticsearch-transport-couchbase/1.2.0-dp/elasticsearch-transport-couchbase-1.2.0-dp.zip</a>...</p>
    
    <p>Trying <a href="https://github.com/couchbaselabs/elasticsearch-transport-couchbase/archive/v1.2.0-dp.zip" rel="nofollow">https://github.com/couchbaselabs/elasticsearch-transport-couchbase/archive/v1.2.0-dp.zip</a>...</p>
    
    <p>Trying <a href="https://github.com/couchbaselabs/elasticsearch-transport-couchbase/archive/master.zip" rel="nofollow">https://github.com/couchbaselabs/elasticsearch-transport-couchbase/archive/master.zip</a>...</p>
    
    <p>Downloading .................DONE</p>
    
    <p>Installed <code>couchbaselabs/elasticsearch-transport-couchbase/1.2.0-dp</code> into <code>D:\Install\elasticsearch-1.0.1\plugins\transport-couchbase</code></p>
    
    <p>Usage:</p>
  
  <pre><code>-u, --url     [plugin location]   : Set exact URL to download the plugin from
  
  -i, --install [plugin name]       : Downloads and installs listed plugins [*]
  
  -t, --timeout [duration]          : Timeout setting: 30s, 1m, 1h...
  
  -r, --remove  [plugin name]       : Removes listed plugins
  
  -l, --list                        : List installed plugins
  
  -v, --verbose                     : Prints verbose messages
  
  -s, --silent                      : Run in silent mode
  
  -h, --help                        : Prints this help message
  </code></pre>
    
    <p>[*] Plugin name could be:</p>
  
  <pre><code> elasticsearch/plugin/version for official elasticsearch plugins (download from download.elasticsearch.org)
  
   groupId/artifactId/version   for community plugins (download from maven central or oss sonatype)
  
   username/repository          for site plugins (download from github master)
  </code></pre>
    
    <p>Message: <strong>Error while installing plugin, reason:</strong></p>
    
    <p><strong>IllegalArgumentException: Plugin installation assumed to be site plugin, but contains source code, aborting installation.</strong></p>
  </blockquote>
  
  <p>Why is that ?</p>
  
  <p>10x,</p>