Maximum number of indexes to keep in the cache

The maximum number indexes to keep in the cache cannot be changed unless the cache does not contain any indexes that are in use (being used to for a search in progress). If any indexes are currently in use, an attempt to change maxCount will be ignored. 

The actual number of open indexes in a cache will depend on the level of activity. For example, if the cache has maxCount set to 10 but only one index is being searched on a single thread, the cache will never contain more than one index. On the other hand, if the a single index is being searched on three threads, the cache may have up to three instances of that index.