// default field names:
	// _all : default field
	// _uid: uid field

	// match all docs query
	{

	  "match_all" : {
	    "boost" : 1.2                  // boost, optional, if not specified, Lucene default will be used
	  },

	// id query
	  "ids" : {
	    "values" : ["1","4","100"],
	    "excludes" : ["5"],
	    "boost" : 1.0    
	  },

	// query string
	// constructs a Lucene QueryParser and parses the query text
	  "query_string" : {
	    "default_field" : "contents",       // if not specified, defaults to: _all
	    "query" : "this AND that OR thus",  // if null, defaults to match all docs query, all other parameters are ignored
	    "default_operator" : "AND",         // default operator, default: OR
	    "allow_leading_wildcard" : false,   // default: false
	    "lowercase_expanded_terms" : false,  // default: false
	    "enable_position_increments" : false, // default: false
	    "fuzzy_prefix_length" : 0,              // default: 0
	    "fuzzy_min_sim" : 0.5,                  // default: 0.5f
	    "phrase_slop" : 0,                      // default: 0
	    "boost" : 1.0,                          // default: 1.0
	    "auto_generate_phrase_queries": false,   // default: false,

	    // multi field
	    "fields" : ["content","name^5"],
	    "use_dis_max": true,
	    "tie_breaker": 0
	  },

	// text query
	  "text" : {
	    "message" : "this is a test",   // field: "message", query: "this is a test"
	    "operator" : "or",              // operator, possible values: "and", "or"
	    "type" : "phrase"               // query type, can be "phrase", "phrase_prefix"
	  },

	// term query
	  "term" : {
	    "color" : "red"

	    // or "color" : {"value" : "red", "boost": 2.0}
	  },

	// boolean query
	  "bool" : {
	    "must" : {
	      "term" : { "color" : "red" }
	    },
	    "must_not" : {
	      "range" : {
	        "age" : { "from" : 10, "to" : 20 }
	      }
	    },
	    "should" : [
	      {
	        "term" : { "tag" : "wow"}
	      },
	      {
	        "term" : { "tag" : "search"}
	      }
	    ],
	    "minimum_number_should_match" : 1,   // if there is no should item above, this one will be ignored;
	    "boost" : 1.0,
	    "disable_coord" : false            // optional: default = false
	  },

	// dist max
	  "dis_max" : {
	    "tie_breaker" : 0.7,
	    "boost" : 1.2,
	    "queries" : [
	      {
	        "term" : { "age" : 34 }
	      },
	      {
	        "term" : { "age" : 35 }
	      }
	    ]
	  },

	  "path" : {
	    "city" : "china/beijing"
	  },

	// prefix
	  "prefix" : { 
	    "user" : "ki" 

	    // or
	    // "user" : {"value" : "ki", "boost" : 2.0 } 
	  },

	// wildcard
	  "wildcard" : { 
	    "user" : "ki*y" 

	    // or 
	    //"user" : { "value" : "ki*y", "boost" : 2.0 } 
	  },
	// range
	  "range" : {
	    "age" : { 
	      "from" : 10, 
	      "to" : 20, 
	      "boost" : 2.0,
	      "_noOptimize" : false
	    }
	  },
	
	// filtered
	
	  "filtered" : {
	      // any query object
	    "query" : {
	      "term" : { "tag" : "wow" }
	    },
	       // any filter defined in the filters.json
	    "filter" : {
	      "range" : {
	        "age" : { "from" : 10, "to" : 20 }
	      }
	    }
	  },
	  
	// terms
	  "terms" : {
	    "tags" : {
	      "values" : [ "blue", "pill" ],
	      "excludes" : ["red"],
	      "minimum_match" : 1,
	      "operator" : "or",
	      "boost": 1.0     //  optional, 1.0 as default value;
	      }
	  },	  

	// span term
	  "span_term" : { 
	    "color" : "red" 

	    //or
	    // "user" : { "value" : "kimchy", "boost" : 2.0 } 
	  },
	// span or
	  "span_or" : {
	    "clauses" : [
	      { "span_term" : { "field" : "value1" } },
	      { "span_term" : { "field" : "value2" } },
	      { "span_term" : { "field" : "value3" } }
	    ]
	  },
	
	// span not
	  "span_not" : {
	    "include" : {
	      "span_term" : { "field" : "value1" }
	    },
	    "exclude" : {
	      "span_term" : { "field" : "value2" }
	    }
	  },
	
	// span near
	  "span_near" : {
	    "clauses" : [
	      { "span_term" : { "field" : "value1" } },
	      { "span_term" : { "field" : "value2" } },
	      { "span_term" : { "field" : "value3" } }
	    ],
	    "slop" : 12,
	    "in_order" : false,
	    "collect_payloads" : false
	  },

	// span first
	  "span_first" : {
	    "match" : {
	      "span_term" : { "color" : "red" }
	    },
	    "end" : 3
	  },

	// custom
	  "custom" : {
	    "class" : "com.sensidb.query.TestQuery",
	    "params":{

	    },
	    "boost" : 2.0
	  }
	}