magento2: Search REST API returns wrong total_count

Preconditions

1. Magento 2.2.2

Steps to reproduce

1. Make a request to endpoint GET /V1/search and provide searchCriteria[pageSize].
2. Repeat the previous point with searchCiteria[currentPage] = 2

Expected result

1. You will get a response with number of items equals searchCriteria[pageSize] in the first time
2. You will get a response with number of items <= searchCriteria[pageSize] in the second time
3. The total_count is the same on both requests

Actual result

The value of total_count equals searchCriteria[pageSize] not the total count of the search result items.