This class can create a new index or open an existing index and add documents to it.

这个类能创建一个新的索引或者打开一个已存在的索引并为该所引添加文档。

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If you define uniqueness on multiple attributes within a class, create one index that includes all the attributes.

如果在一个类中的多个属性上定义惟一性，那么应该创建一个包含所有这些属性的索引。

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An abstract class that represents the location where index files are stored.

表示索引文件存储位置的抽象类。

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Finally, the asset class should be investible with low-cost index funds and ETFs, or a least a near-index type, broadly diversified actively managed fund.

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