I'm indexing and searching documents using solr 6.x. It is quite efficient when there are fewer shards and fewer cluster units. However, when the number of shards exceeds 30 and the size of each shard is 30G, the search performance is significantly reduced. Currently, usercache in solr is actively used, so we plan queryResultCache for the entire shards. Is this the right solution what trying to use an external cache?(for example, redis, memcahced, apache ignite, etc.)
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