我将Java版本从java 6升级到java 7并重新启动了elasticsearch。但现在它未能启动，我无法弄清楚原因。日志如下所示：
[2015-06-26 12:39:12,151][INFO ][node ] [D'Spayre] version[1.4.0], pid[17934], build[bc94bd8/2014-11-05T14:26:12Z]
[2015-06-26 12:39:12,152][INFO ][node ] [D'Spayre] initializing ...
[2015-06-26 12:39:12,157][ERROR][bootstrap ] {1.4.0}: Initialization Failed ...
- NullPointerException[null]
有没有人遇到类似问题？