Conditional filter to apply to the string hierarchies. Here is a list of all available conditions:

• equal – String. Equal to some value. Example: { "equal": "aaa" }.
• not_equal – String. Not equal to some value. Example: { "not_equal": "aaa" }.
• begin – String. Begins with some value. Example: { "begin": "aaa" }.
• not_begin – String. Does not begin with some value. Example: { "not_begin": "aaa" }.
• end – String. Ends with some value. Example: { "end": "aaa" }.
• not_end – String. Does not end with some value. Example: { "not_end": "aaa" }.
• contain – String. Contains some value. Example: { "contain": "aaa" }.
• not_contain – String. Does not contain some value. Example: { "not_contain": "aaa" }.
• greater – String. Greater than some value. Example: { "greater": "aaa" }.
• greater_equal – String. Greater than or equal to some value. Example: { "greater_equal": "aaa" }.
• less – String. Less than some value. Example: { "less": "aaa" }.
• less_equal – String. Less than or equal to some value. Example: { "less_equal": "aaa" }.
• between – Array of strings. Between two values (including them). Example: { "between": ["aaa", "bbb"] }.
• not_between – Array of strings. Not between two values (excluding them). Example: { "not_between": ["aaa", "bbb"] }.