不过怎样，查询刨析器不是线程级安全的，所以每个使用索引的线程都需要有自己的查询刨析器。

However, the query parser is not thread safe, so each thread using the index should have its own query parser.

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而索引写者是线程级安全的，所以你能在人们搜索它时更新索引。

The index writer however, is thread safe, so you can update the index while people are searching it.

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管理和安全新指南，第30章：管理索引搜索。

Administration and Security Guide, Chapter 30: Managing Index search.

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