Logstash/Elasticsearch crash - old indicies not available anymore


I recently upgraded my logstash/elasticsearch/kibana-installation to 1.4.2
with elasticsearch 1.1.1 on a RHEL6.5. During the last couple of days,
logstash and elasticsearch crashed (java heap space). The problem is, after
restarting logstash (with embedded elasticsearch) my old indices are not
there anymore. They are still there at the operating system level, but
elasticsearch does not show them anymore.

Is there any way to let elasticsearch rediscover them? Thanks!

best regards,

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