Request cache, hit_count and miss_count

Elastic Stack Elasticsearch
1

When I fired curl 'localhost:9200/_stats/request_cache?pretty&human', I get this response

"publications_v1": {
     "primaries": {
        "request_cache": {
           "memory_size_in_bytes": 59235358,
           "evictions": 0,
           "hit_count": 42,
           "miss_count": 18
        }
     },
     "total": {
        "request_cache": {
           "memory_size_in_bytes": 103692054,
           "evictions": 0,
           "hit_count": 84,
           "miss_count": 36
        }
     }
  }

What do the miss_count and hit_count keys signify here?

2

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