According to 
http://www.elasticsearch.org/blog/all-about-elasticsearch-filter-bitsets/ 
filters inside an and-filter don't use a BitSet but only check the 
conditions inside the iterated documents.

When I look at the explanation of

GET megacorp/employee/_search?explain=1
{
  "query": {
    "filtered": {
      "filter": {
        "and": [
          { "term": { "age": "25" } },
          { "term": { "last_name": "smith" } }
        ]
      }
    }
  }
}

it says:

"_explanation": {
   "value": 1,
   "description": "ConstantScore(+cache(age:[25 TO 25]) 
+cache(last_name:smith)), product of:",
   "details": [
      { "value": 1, "description": "boost" }, { "value": 1, "description": 
"queryNorm" }
   ]
}

What does that "cache()" actually mean and how is it beneficial to check 
conditions in each document?

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