Filters documents with fields that have terms within a certain range. Similar to range query, except that it acts as a filter. Can be placed within queries that accept a filter.

{
    "constant_score" : {
        "filter" : {
            "range" : {
                "age" : { 
                    "from" : "10", 
                    "to" : "20", 
                    "include_lower" : true, 
                    "include_upper" : false
                }
            }
        }
    }
}

The range filter top level parameters include:

• from: The lower bound. Defaults to start from the first.
• to: The upper bound. Defaults to unbounded.
• include_lower: Should the first from (if set) be inclusive or not. Defaults to true.
• include_upper: Should the last to (if set) be inclusive or not. Defaults to true.
• gt: Same as setting from to the value, and include_lower to false.
• gte: Same as setting from to the value, and include_lower to true.
• lt: Same as setting to to the value, and include_upper to false.
• lte: Same as setting to to the value, and include_upper to true.

The result of the filter is automatically cached by default. The _cache can be set to false to turn it off.