solr/example/example-DIH/solr/rss/conf/update-script.js
function processAdd(cmd) {

  doc = cmd.solrDoc;  // org.apache.solr.common.SolrInputDocument
  id = doc.getFieldValue("id");
  logger.info("update-script#processAdd: id=" + id);

// Set a field value:
//  doc.setField("foo_s", "whatever");

// Get a configuration parameter:
//  config_param = params.get('config_param');  // "params" only exists if processor configured with <lst name="params">

// Get a request parameter:
// some_param = req.getParams().get("some_param")

// Add a field of field names that match a pattern:
//   - Potentially useful to determine the fields/attributes represented in a result set, via faceting on field_name_ss
//  field_names = doc.getFieldNames().toArray();
//  for(i=0; i < field_names.length; i++) {
//    field_name = field_names[i];
//    if (/attr_.*/.test(field_name)) { doc.addField("attribute_ss", field_names[i]); }
//  }

}
function processAdd(cmd) {

  doc = cmd.solrDoc;  // org.apache.solr.common.SolrInputDocument
  id = doc.getFieldValue("id");
  logger.info("update-script#processAdd: id=" + id);

// Set a field value:
//  doc.setField("foo_s", "whatever");

// Get a configuration parameter:
//  config_param = params.get('config_param');  // "params" only exists if processor configured with <lst name="params">

// Get a request parameter:
// some_param = req.getParams().get("some_param")

// Add a field of field names that match a pattern:
//   - Potentially useful to determine the fields/attributes represented in a result set, via faceting on field_name_ss
//  field_names = doc.getFieldNames().toArray();
//  for(i=0; i < field_names.length; i++) {
//    field_name = field_names[i];
//    if (/attr_.*/.test(field_name)) { doc.addField("attribute_ss", field_names[i]); }
//  }

}
/*
This is a basic skeleton JavaScript update processor.

In order for this to be executed, it must be properly wired into solrconfig.xml; by default it is commented out in
the example solrconfig.xml and must be uncommented to be enabled.

See http://wiki.apache.org/solr/ScriptUpdateProcessor for more details.