Simon Willnauer 72982d955a Use current settings as default in BalancedShardsAllocator instead of defaults.
Custom settings are not always present in the `Settings` that are passed
to `NodeSettingsService.Listener#onRefreshSettings` such that using the defaults
will necessarily override the custom settings if set before.

Closes #2973
2013-05-02 16:23:48 +02:00
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