Unassigned shards after adding Shard Allocation Awareness

[meons]

I have an elastic cluster with 4 nodes running elasticsearch 2.3.3 with 3TB data and I use Kopf plugin as cluster "dashboard".
I changed my cluster configuration by adding Shard Allocation Awareness, so I added the following lines in elasticsearch.yml on my nodes :

Nodes 1 and 2:

node.rack_id: 01
cluster.routing.allocation.awareness.attributes: rack_id

Nodes 3 and 4:

node.rack_id: 02
cluster.routing.allocation.awareness.attributes: rack_id

Then I have restarted elasticsearch service on each node one by one bit I still have 133 unassigned shards on my cluster. First I had around 1000 shards which has been reallocated and the decease stoped at 133 shards. It's seems that the process is running and still trying to reallocate theses shards.

I alredy tried to disable and enable routing.allocation but the issue is still present.

PUT /_cluster/settings
{
"transient" : {
"cluster.routing.allocation.enable" : "none"
}
}
PUT /_cluster/settings
{
"transient" : {
"cluster.routing.allocation.enable" : "all"
}
}

Do you have any idea how can I fix that ?

[Christian_Dahlqvist]

Do you have any indices with more then 1 replica configured?

[meons]

Nope, all indices with unassigned shards have 1 replica configured ("number_of_replicas": "1").

[meons]

I have already tried that a few months ago so I know if I remove Shard Allocation Awareness configuration and restart elasticsearch service in all nodes, all shards will be allocated. But know I really need this configuration to ensure that all replicas will only be on nodes that are in the same rack.