How to cache Timestamp field for faster retrieval of data from elasticsearch?

I have mapping like this:

{
    "TimeStamp" : "value",
    "Tag1" : [ "key" : "value1", "key2" : "value2", "key3" : "value3" ]
    "Tag2" : "value"
}

I have millions of documents.
I would like to cache these documents based on TimeStamp field for faster retrieval of _search queries.
Think something on the lines of Oracle cache in SQL.
How do I achieve this?
Also, any tips on storing this kind of data will be appreciated. Thanks.

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