IndexNotFoundException: how to recover?

Howdy all,

My cluster gone mad after customising http.max_content_length (256mb) in
order to be able to index bigger file (default is 100Mb) through HTTP api.
It didn't work so I reverted to the default value, but the cluster is not
healthy anymore:
"cluster_name" : "elasticsearch",
"status" : "red",
"timed_out" : false,
"number_of_nodes" : 1,
"number_of_data_nodes" : 1,
"active_primary_shards" : 0,
"active_shards" : 0,
"relocating_shards" : 0,
"initializing_shards" : 0,
"unassigned_shards" : 4

Here is an extract of the log:

I would like to investigate/debug further on the following error:
IndexNotFoundException[no segments* file found in
type=MERGE, rate=20.0)]): files: []

However I don't know how/where to start. I tried to remove segments.gen
since I found similar issue on the internets, but I don't have any file
named segments.gen...

I'm using elasticsearch 1.2.1.

Does someone already encountered this issue?

Kind regards,
Nicolas Terray

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