title: I'm getting data as Form Data instead of JSON in remote pagination
body: <p><strong>I am using Tabulator remote pagination with following config</strong></p>
  
  <pre><code>table = new Tabulator("#data-table", {height : "800px",
                                              pagination : "remote",
                                              overflow:"auto",
                                              layout : "fitData",
                                              paginationButtonCount : 6,
                                              ajaxFiltering:true,
                                              headerFilterPlaceholder:"",
                                              ajaxSorting:true,
                                              placeholder : "No Records Found. Click on 'Clear All Filters' button to clear the filters if any",
                                              keybindings:false,
                                              ajaxURL: "findDataSet", 
                                               ajaxConfig:{
                                                   method:"POST", 
                                               },
                                              ajaxContentType:"JSON",
                                              columns : columsData,
                                              ajaxParams:{waveId:waveId,primaryClecName : primaryClecName,status:status,noOfCircuits:noOfCircuits},
                                              paginationDataReceived:{
                                                  "last_page":"maxNumberOfPage", 
                                                  "data":"ntportalFields", } 
  });
  </code></pre>
  
  <p><strong>I am expecting request payload (JSON format) in the java service. But I'm getting form data as below.</strong></p>
  
  <pre><code>------WebKitFormBoundary9ajA2zFVTs7hpxzL
  Content-Disposition: form-data; name="waveId"
  
  11833
  ------WebKitFormBoundary9ajA2zFVTs7hpxzL
  Content-Disposition: form-data; name="primaryClecName"
  
  ACCESS%20POINT%20INC
  ------WebKitFormBoundary9ajA2zFVTs7hpxzL
  Content-Disposition: form-data; name="status"
  
  Migration%20Complete
  ------WebKitFormBoundary9ajA2zFVTs7hpxzL
  Content-Disposition: form-data; name="noOfCircuits"
  
  5
  ------WebKitFormBoundary9ajA2zFVTs7hpxzL
  Content-Disposition: form-data; name="page"
  
  1
  ------WebKitFormBoundary9ajA2zFVTs7hpxzL
  Content-Disposition: form-data; name="size"
  </code></pre>
  
  <p><strong>How can I get it as JSON format?
  Thanks in advance :)</strong></p>