Hi I setup Workplace search and make a source connection to sharepoint as I got instruction from this url
https://www.elastic.co/guide/en/workplace-search/current/workplace-search-sharepoint-online-connector.html
It is connected to sharepoint by Client ID and Client Secret. After that I click on Connect Sharepoint Online and select disable Enable document-level permission synchronization option, I go through Connect Sharepoint Online and login sharepoint from admin id and give all permission.
Now it is crawling only few document. It is not crawling all document.