Elasticsearch 2.2 issues

Hello.
We use elasticsearch version 1.3.4-1 in our production with ~7000 req/per sec. Now we want to move our prodcution environment to a newer version of the elastic 2.2.

cluster.name: index1
node.name: host1
node.rack: c-kxxx
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
network.host: 0.0.0.0
http.port: 9075
transport.tcp.port: 9076
discovery.zen.ping.unicast.hosts: ["host1", "host2", "host3", "host4", "host5"]

During testing, we had problems with the responses from the engine. A lot of blocked threads in the query cache.

"elasticsearch[dc580][search][T#300]" #473 daemon prio=5 os_prio=0 tid=0x00007feac40a2000 nid=0x3f0a waiting for monitor entry [0x00007fe862308000]
java.lang.Thread.State: BLOCKED (on object monitor)
at org.apache.lucene.search.LRUQueryCache.get(LRUQueryCache.java:218)
- waiting to lock <0x0000000444508478> (a org.elasticsearch.indices.cache.query.IndicesQueryCache$1)
at org.apache.lucene.search.LRUQueryCache$CachingWrapperWeight.scorer(LRUQueryCache.java:622)
at org.elasticsearch.indices.cache.query.IndicesQueryCache$CachingWeightWrapper.scorer(IndicesQueryCache.java:263)
at org.apache.lucene.search.DisjunctionMaxQuery$DisjunctionMaxWeight.scorer(DisjunctionMaxQuery.java:177)
at org.apache.lucene.search.LRUQueryCache$CachingWrapperWeight.scorer(LRUQueryCache.java:628)
at org.elasticsearch.indices.cache.query.IndicesQueryCache$CachingWeightWrapper.scorer(IndicesQueryCache.java:263)
at org.apache.lucene.search.BooleanWeight.scorer(BooleanWeight.java:280)

Someone faced with such problems?

Best Regards, Artem Miroshnichenko.