Hi guys, 
I have one node with 4 different indices on it. Each index has 2 shard and 
one replica (which is just defined without actual replicating since only 
one node is currently applicable). Sizes of indexing is: 
ads1 
size: 18.5G (18.5G) 
docs: 4,414,787 (4,414,787) 

ads2 
size: 19.1G (19.1G) 
docs: 4,259,828 (4,259,828) 
        
ads3 
size: 18.9G (18.9G) 
docs: 4,221,637 (4,221,637) 
        
ads4 
size: 20.3G (20.3G) 
docs: 4,263,329 (4,263,329). 

>From some point the ES stopped responding to rest request, even as simple 
as count 
http://somemachine:9200/ads1/pagedocuments/_count
The Head plugin, however, seems to be working - it show the info about 
indices, etc.. 
Latest logs from ES console are: 
[2014-06-22 17:13:58,922][INFO ][index.engine.internal    ] [adds_node_one] 
[ads2][0] stop throttling indexing: numMergesInFlight=4, maxNumMerges=5 
[2014-06-22 17:13:58,922][INFO ][index.engine.internal    ] [adds_node_one] 
[ads2][0] now throttling indexing: numMergesInFlight=6, maxNumMerges=5 
[2014-06-22 19:16:13,384][INFO ][index.engine.internal    ] [adds_node_one] 
[ads2][0] stop throttling indexing: numMergesInFlight=4, maxNumMerges=5 
[2014-06-22 19:16:13,535][INFO ][index.engine.internal    ] [adds_node_one] 
[ads2][0] now throttling indexing: numMergesInFlight=6, maxNumMerges=5 
[2014-06-22 20:54:46,650][INFO ][index.engine.internal    ] [adds_node_one] 
[ads2][0] stop throttling indexing: numMergesInFlight=4, maxNumMerges=5 
[2014-06-22 20:54:46,655][INFO ][index.engine.internal    ] [adds_node_one] 
[ads2][0] now throttling indexing: numMergesInFlight=6, maxNumMerges=5 
[2014-06-22 23:19:08,747][INFO ][monitor.jvm              ] [adds_node_one] 
[gc][young][36246][12421] duration [886ms], collections [1]/[1.6s], total 
[886ms]/[5.7m], memory [3.2gb]->[2.9gb]/[4.9gb], all_po 
ols {[young] [449.6mb]->[107.5mb]/[532.5mb]}{[survivor] 
[40.9mb]->[63.2mb]/[66.5mb]}{[old] [2.8gb]->[2.8gb]/[4.3gb]} 
[2014-06-22 23:19:50,901][INFO ][index.engine.internal    ] [adds_node_one] 
[ads2][0] stop throttling indexing: numMergesInFlight=4, maxNumMerges=5 
[2014-06-22 23:19:50,901][INFO ][index.engine.internal    ] [adds_node_one] 
[ads2][0] now throttling indexing: numMergesInFlight=6, maxNumMerges=5 
[2014-06-22 23:24:24,878][WARN ][monitor.jvm              ] [adds_node_one] 
[gc][young][36494][12533] duration [1.5s], collections [1]/[3.1s], total 
[1.5s]/[5.8m], memory [3.4gb]->[3.3gb]/[4.9gb], all_pool 
s {[young] [234.6mb]->[62.1mb]/[532.5mb]}{[survivor] 
[65.4mb]->[50.5mb]/[66.5mb]}{[old] [3.1gb]->[3.2gb]/[4.3gb]} 
[2014-06-22 23:47:07,611][WARN ][monitor.jvm              ] [adds_node_one] 
[gc][young][37569][13012] duration [1.7s], collections [1]/[2.6s], total 
[1.7s]/[6.1m], memory [3.6gb]->[3.3gb]/[4.9gb], all_pool 
s {[young] [341.7mb]->[13.8mb]/[532.5mb]}{[survivor] 
[66.5mb]->[66.5mb]/[66.5mb]}{[old] [3.2gb]->[3.2gb]/[4.3gb]} 
[2014-06-22 23:57:15,573][WARN ][monitor.jvm              ] [adds_node_one] 
[gc][young][38039][13231] duration [1s], collections [1]/[2.6s], total 
[1s]/[6.3m], memory [3.2gb]->[3.1gb]/[4.9gb], all_pools {[ 
young] [301.7mb]->[215.7mb]/[532.5mb]}{[survivor] 
[48.3mb]->[37.9mb]/[66.5mb]}{[old] [2.8gb]->[2.8gb]/[4.3gb]} 
[2014-06-22 23:57:25,552][WARN ][monitor.jvm              ] [adds_node_one] 
[gc][young][38046][13235] duration [1s], collections [1]/[2.5s], total 
[1s]/[6.3m], memory [3.2gb]->[3gb]/[4.9gb], all_pools {[yo 
ung] [293.9mb]->[78.1mb]/[532.5mb]}{[survivor] 
[62.9mb]->[49.4mb]/[66.5mb]}{[old] [2.9gb]->[2.9gb]/[4.3gb]} 

Does anybody have any ideas? Perhaps we came close to some limit of ES on 
this machine? 

Any advice will be appreciated..

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