json_schema: {
      "$schema": "http://json-schema.org/draft-06/schema#",
      "maxProperties": 1,
      "additionalProperties": false,
      "properties": {
          "interface_filters": {
              "$id": "/properties/interface_filters",
              "type": "array",
              "items": {
                  "$id": "/properties/interface_filters/items",
                  "type": "object",
                  "maxProperties": 2,
                  "additionalProperties": false,
                  "properties": {
                      "op": {
                          "enum": [
                              "regex",
                              "startwith"
                          ]
                      },
                      "expr": {
                          "type": "string"
                      }
                  },
                  "title": "filter object",
                  "description": "filter object having op and expr fields",
                  "default": {},
                  "examples": [
                      {
                          "op": "regex",
                          "expr": "^ge-"
                      },
                      {
                          "op": "regex",
                          "expr": "^xe"
                      }
                  ]
              }
          }
      }
  }