参考http://elasticsearch.cn/article/32
_optimize
优化前

GET _cat/indices/product95_new_users?v\&h=index,docs.count,docs.deleted,store.size,tm
product95_new_users 203037 24838 326.6mb 1.5mb

优化方法

POST product95_new_users/_optimize?max_num_segments=1

优化后

GET _cat/indices/product95_new_users?v\&h=index,docs.count,docs.deleted,store.size,tm
product95_new_users 203037 0 392.1mb 881.6kb

其它优化方法参考 http://elasticsearch.cn/article/32