solr 的 statistics 页面 optimized
此外，他解释一些运行参数：
| Optional Attribute | Description |
|---|---|
| waitSearch | Default is true. Blocks until a new searcher is opened and registered as the main query searcher, making the changes visible |
| expungeDeletes | (commit only)Default is false. Merges segments that have more than 10% deleted docs,expunging them in the process. |
| maxSegments | (optimize only)Default is 1. Merges the segments down to no more than this number of segments |
example： http://solr5.test.pingansec.com/solr/db/update?optimize=true&waitFlush=true&wt=json&_=1541554644867&maxSegments=8&expungeDeletes=true
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