Is it possible to change the display name of a Field in Content type using CSOM. We also want to change the description but these two properties are seems to be Read Only in field links property of content type. 

We have achieved it using powershell but would be helpful if the same is achieved using Client

Hi,

Please check the code snippet below:

ClientContext cc= new ClientContext(SiteUrl);
 Web site = cc.Web;
 var list = site.Lists.GetByTitle(listname);
 cc.Load(list.Fields.GetByTitle(fieldname));
 cc.ExecuteQuery();
 var field = list.Fields.GetByTitle(fieldname);

 field.DisplayName = "newName"; 
 field.Update(); 

 context.ExecuteQuery(); 

Here is a similar thread for your reference:

https://social.msdn.microsoft.com/Forums/office/en-US/0bf7a594-8ff1-4205-94e8-5ad460e280c8/is-it-possible-to-change-display-name-of-any-column-in-content-type-using-client-object-model?forum=sharepointgeneral

Best Regards