What are the allowed condition types in Magento 2?
available conditions
"eq" => equalValue
"neq" => notEqualValue
"like" => likeValue
"nlike" => notLikeValue
"is" => isValue
"in" => inValues
"nin" => notInValues
"notnull" => valueIsNotNull
"null" => valueIsNull
"moreq" => moreOrEqualValue
"gt" => greaterValue
"lt" => lessValue
"gteq" => greaterOrEqualValue
"lteq" => lessOrEqualValue
"finset" => valueInSet
"from" => fromValue, "to" => toValue
https://devdocs.magento.com/guides/v2.3/rest/performing-searches.html