Filter by content_type and language

[osheinin]

When I do the following request
curl -X GET "https://archive.kbb1.com/backend/content_units?page_no=1&page_size=10&content_type=LESSON_PART&language=en"
I'm getting the answer that is not filtered by content type or language.
Is this behaviour by design?
What parameters should I send in order to get output that filtered properly?
{
"total":22620,
"content_units":[
{
"id":"P17qNyRZ",
"content_type":"LESSON_PART",
"film_date":"2018-06-05",
"name":"Baal HaSulam. The Teaching of the Kabbalah and Its Essence",
"duration":2225,
"original_language":"he",
"collections":{
"ZGJISg6a____2":{
"id":"ZGJISg6a",
"content_type":"DAILY_LESSON",
"film_date":"2018-06-05",
"number":1
}
}
},
{
"id":"JzxgM8BO",
"content_type":"LESSON_PART",
"film_date":"2018-06-05",
"name":"Lesson on the topic of "Connection in the Ten"",
"duration":7195,
"original_language":"he",
"collections":{
"ZGJISg6a____1":{
"id":"ZGJISg6a",
"content_type":"DAILY_LESSON",
"film_date":"2018-06-05",
"number":1
}
}
},
{
"id":"ZPDq3dhe",
"content_type":"LESSON_PART",
"film_date":"2018-06-05",
"name":"Preparation to the Lesson",
"duration":742,
"original_language":"he",
"collections":{
"ZGJISg6a____0":{
"id":"ZGJISg6a",
"content_type":"DAILY_LESSON",
"film_date":"2018-06-05",
"number":1
}
}
},
{
"id":"rKfmYCIA",
"content_type":"LESSON_PART",
"film_date":"2018-06-04",
"name":"Zohar for All. Pekudei, article "The Palace of Desire, Tifferet", item 715",
"duration":3505,
"original_language":"he",
"collections":{
"NvwNlK7x____1":{
"id":"NvwNlK7x",
"content_type":"DAILY_LESSON",
"film_date":"2018-06-04",
"number":2
}
}
},
{
"id":"PKFL0xF4",
"content_type":"LESSON_PART",
"film_date":"2018-06-04",
"name":"Baal HaSulam. The Teaching of the Kabbalah and Its Essence",
"duration":2218,
"original_language":"he",
"collections":{
"fTjVhvBp____3":{
"id":"fTjVhvBp",
"content_type":"DAILY_LESSON",
"film_date":"2018-06-04",
"number":1
}
}
},
{
"id":"wc7EEo07",
"content_type":"LESSON_PART",
"film_date":"2018-06-04",
"name":"Baal HaSulam. TES. Vol. 1. Part 4, Histaklut Pnimit, chapter 1, item 6",
"duration":2088,
"original_language":"he",
"collections":{
"fTjVhvBp____2":{
"id":"fTjVhvBp",
"content_type":"DAILY_LESSON",
"film_date":"2018-06-04",
"number":1
}
}
},
{
"id":"4Lzj9FfQ",
"content_type":"LESSON_PART",
"film_date":"2018-06-04",
"name":"Lesson on the topic of "The Work in Faith Above Reason"",
"duration":4974,
"original_language":"he",
"collections":{
"fTjVhvBp____1":{
"id":"fTjVhvBp",
"content_type":"DAILY_LESSON",
"film_date":"2018-06-04",
"number":1
}
}
},
{
"id":"fytlrNdb",
"content_type":"LESSON_PART",
"film_date":"2018-06-04",
"name":"Preparation to the Lesson",
"duration":745,
"original_language":"he",
"collections":{
"fTjVhvBp____0":{
"id":"fTjVhvBp",
"content_type":"DAILY_LESSON",
"film_date":"2018-06-04",
"number":1
}
}
},
{
"id":"AjbQmYQP",
"content_type":"LESSON_PART",
"film_date":"2018-06-03",
"name":"Baal HaSulam. The Teaching of the Kabbalah and Its Essence",
"duration":2427,
"original_language":"he",
"collections":{
"0VTisZTN____3":{
"id":"0VTisZTN",
"content_type":"DAILY_LESSON",
"film_date":"2018-06-03",
"number":1
}
}
},
{
"id":"cZPkoppr",
"content_type":"LESSON_PART",
"film_date":"2018-06-03",
"name":"Baal HaSulam. TES. Vol. 1. Part 4, chapter 6, item 18",
"duration":2893,
"original_language":"he",
"collections":{
"0VTisZTN____2":{
"id":"0VTisZTN",
"content_type":"DAILY_LESSON",
"film_date":"2018-06-03",
"number":1
}
}
}
]
}
Thank you