Sharepoint define search scope using csom

I have a sharepoint installation with multiple site collections, let's say siteA, siteB e.t.c

I am using the following code to search in sharepoint

    using (ClientContext context = Connect())
    {
         KeywordQuery keywordQuery = new KeywordQuery(context);
         keywordQuery.QueryText = "text to search";
         SearchExecutor searchExecutor = new SearchExecutor(context);
         ClientResult<ResultTableCollection> results = searchExecutor.ExecuteQuery(keywordQuery);
         context.ExecuteQuery();
     }   

and the results i am getting are from all sites siteA, siteB etc. Is there anyway to specify that i want the search to be performed only in siteA and to be even more specific only in Shared Documents of siteA?