[Solr Wiki] Update of "DistributedSearch" by DavidSmiley

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The "DistributedSearch" page has been changed by DavidSmiley:
http://wiki.apache.org/solr/DistributedSearch?action=diff&rev1=20&rev2=21

Comment:
Doesn't support MoreLikeThis

     * '''The unique key field must be unique across all shards.'''  If docs with duplicate unique keys are encountered, Solr will make an attempt to return valid results, but the behavior may be non-deterministic.
     * No distributed idf (see http://wunderwood.org/most_casual_observer/2007/04/progressive_reranking.html ) (Also see https://issues.apache.org/jira/browse/SOLR-1632 for some new work on this feature.)
     * Doesn't support !QueryElevationComponent
+    * Doesn't support MoreLikeThis -- (see https://issues.apache.org/jira/browse/SOLR-788 )
     * The index could change between stages, e.g. a document that matched a query and was subsequently changed may no longer match but will still be retrieved.
     * Doesn't currently support date faceting (see https://issues.apache.org/jira/browse/SOLR-1709 )
     * Makes it more inefficient to use a high "start" parameter. For example, if you request start=500000&rows=25 on an index with 500,000+ docs per shard, this will currently result in 500,000 records getting sent over the network from the shard to the coordinating Solr instance. If you had a single-shard index, in contrast, only 25 records would ever get sent over the network. (Granted, setting start this high is not something many people need to do.)