Recover failed ES shard

http://www.jillesvangurp.com/2015/02/18/elasticsearch-failed-shard-recovery/

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Resize Heap and Disable Swapping for Elasticsearch

According to ES Heap: sizing and swapping,
1. Allocate 50% of RAM to heap

In /etc/init.d/elasticsearch, configure “ES_HEAP_SIZE = 10g”

2. Disable swapping

in /etc/elasticsearch/elasticsearch.yml, uncomment “bootstrap.mlockall”