docs: def get_json(self):
          """Create JSON for FCBootEnvironment.
  
          :returns: JSON for FCBootEnvironment as follows:
  
              {
                  "FCBootEnvironment":{
                      "FCTargets":{
                          "FCTarget":[
                          ]
                      },
                      "FCLinkSpeed":{
                      },
                      "SANBootEnable":{
                      },
                      "FCTopology":{
                      }
                  }
              }
          """
          json = self.get_basic_json()
          for i in range(len(self.targets)):
              # @FCTargetIdx starts from 1.
              self.targets[i].set_index(i + 1)
          json['FCTargets'] = {
              'FCTarget': [t.get_json() for t in self.targets]
          }
          return {'FCBootEnvironment': json}