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{ "query":{"interval":{"json_param":"int_q"}},
  "params":{"int_q":"foo bar"}
}

IntervalSource Object

parsing JSON query. Notice abbreviations used below: IS, I.x. 

{ "query":{"interval":{"json_param":"int_q"}},
  "params":{"int_q":{ // this is IntervalSource object, referred as IS object below
 
               // these props are exclusive, only one of them is allowed
                       "phrase": "token stream goes to I.phrase()", // or ["any other", "string. token streams are concatenated (flattern) and go to I.phrase()", {/* or separate IS objs as elems*/}]  
                       "prefix": "passes *multiterm* field analysis, strictly expecting single token stream, turns to I.prefix()"
                       "term": "passes field analysis, strictly expecting single token stream, turns to I.term()", // should it support single elem array? ["foo"] 
                       "raw": "bypass analysis, turns to I.term()",
                       "or":[ "token stream handled as one phrase, single token as {term}" , { /* IS object goes here*/ } ],
                       "ordered": "like _phrase_, but turns to I.ordered() ", // or list ["but, no phrase flatterning happens "]
                       "unordered": "like _phrase_, but turns to I.unordered() ", // or list ["but, no phrase flatterning happens "]

               // these might attribute others, but not all of them 
                       "gaps":2,   // Optional. wraps underneath IS with I.maxgaps(), presumably, shouldn't be combined with _phrase_
                       "width":2,  // Optional. wraps underneath IS with I.maxwidth(),  I'm not sure how it's combined with gaps above
                       "field":"title",// Optional. wraps underneath IS with I.fixField(),   
                       "max_expansions":123 // "only for _prefix_" 
                    }
           }
}

Limitations

• ignores PositionIncrement Attribute so far. 

Sample 

{   "query":{"interval":{"json_param":"int_q"}},
    "params":{"int_q": {
                       "ordered": ["Apache", "Software", {"prefix":"Found"}],
                       "gaps":5
                   }
    }
}

.