Query string - URL encoded string containing the parameters to be used for searching. Multiple parameters can be passed in the “attribute:OPERATOR:value” with fixed operators and separated by '|' character.
To search for a product of color black or blue or green, size XL, price between 2000 & 4000 and department Men's, the search query would like -
q=(color:IN:Black;Blue;Green|size:EQUALS:XL|price:RANGE:2000;4000|department:EQUALS:Men)
Urlencoded string = color%3AIN%3ABlack%3BBlue%3BGreen%7Csize%3AEQUALS%3AXL%7Cprice%3ARANGE%3A2000%3B4000%7Cdepartment%3AEQUALS%3AMen

Preferred response format.