[2012-06-22 17:36:17,165][WARN ][indices.cluster ] [Cat-Man] [* myindex*][*1*] failed to start shard
Solution: It means that it cannot recover shard *1* of the index *myindex* on the node Cat-Man. If you take a look at data/elasticsearch/nodes/0/indices/* myindex/1*/translog directory, you will find files like this: translog-123456677899 or translog-123456677899.recovering. One of them will have non-zero length. Move it to a temporary directory and try starting the server.