[Bug] Loader error when not specify pk as id

[liuxiaocs7]

Bug Type (问题类型)

exception / error (异常报错)

schema set name as pk in label person, exec by hg-client to server.

    schema.vertexLabel("person")
            .properties("name", "age", "city")
            .primaryKeys("name")
            .nullableKeys("age", "city")
            .ifNotExist()
            .create();

loader struct conf, not specify id, but got Can't customize vertex id when id strategy is 'PRIMARY_KEY' for vertex label 'person'

 "vertices": [
    {
      "label": "person",
      "input": {
        "type": "file",
        "path": "example/spark/vertex_person.json",
        "format": "JSON",
        "header": ["name", "age", "city"],
        "charset": "UTF-8",
        "skipped_line": {
          "regex": "(^#|^//).*"
        }
      },
      "null_values": ["NULL", "null", ""]
    }

Before submit

• I had searched in the issues and found no similar issues.

Environment (环境信息)

• Server Version: v1.0.0
• Toolchain Version: master
• Data Size: xx vertices, xx edges

Expected & Actual behavior (期望与实际表现)

class java.lang.IllegalArgumentException: Can't customize vertex id when id strategy is 'PRIMARY_KEY' for vertex label 'person'
        at org.apache.hugegraph.exception.ServerException.fromResponse(ServerException.java:45)
        at org.apache.hugegraph.client.RestClient.checkStatus(RestClient.java:91)
        at org.apache.hugegraph.rest.AbstractRestClient.post(AbstractRestClient.java:232)
        at org.apache.hugegraph.rest.AbstractRestClient.post(AbstractRestClient.java:212)
        at org.apache.hugegraph.api.graph.VertexAPI.create(VertexAPI.java:58)

Vertex/Edge example (问题点 / 边数据举例)

No response

Schema [VertexLabel, EdgeLabel, IndexLabel] (元数据结构)

// Define schema
    schema.propertyKey("name").asText().ifNotExist().create();
    schema.propertyKey("age").asInt().ifNotExist().create();
    schema.propertyKey("city").asText().ifNotExist().create();
    schema.propertyKey("weight").asDouble().ifNotExist().create();
    schema.propertyKey("lang").asText().ifNotExist().create();
    schema.propertyKey("date").asText().ifNotExist().create();
    schema.propertyKey("price").asDouble().ifNotExist().create();

    schema.vertexLabel("person")
            .properties("name", "age", "city")
            .primaryKeys("name")
            .nullableKeys("age", "city")
            .ifNotExist()
            .create();

    schema.vertexLabel("software")
            .properties("name", "lang", "price")
            .useCustomizeStringId()
            .ifNotExist()
            .create();

    schema.edgeLabel("knows")
            .sourceLabel("person")
            .targetLabel("person")
            .properties("date", "weight")
            .ifNotExist()
            .create();

    schema.edgeLabel("created")
            .sourceLabel("person")
            .targetLabel("software")
            .properties("date", "weight")
            .ifNotExist()
            .create();

{
  "vertices": [
    {
      "label": "person",
      "input": {
        "type": "file",
        "path": "example/spark/vertex_person.json",
        "format": "JSON",
        "header": ["name", "age", "city"],
        "charset": "UTF-8",
        "skipped_line": {
          "regex": "(^#|^//).*"
        }
      },
      "null_values": ["NULL", "null", ""]
    },
    {
      "label": "software",
      "input": {
        "type": "file",
        "path": "example/spark/vertex_software.json",
        "format": "JSON",
        "header": ["id","name", "lang", "price","ISBN"],
        "charset": "GBK"
      },
      "id": "name",
      "ignored": ["ISBN"]
    }
  ],
  "edges": [
    {
      "label": "knows",
      "source": ["source_name"],
      "target": ["target_name"],
      "input": {
        "type": "file",
        "path": "example/spark/edge_knows.json",
        "format": "JSON",
        "date_format": "yyyyMMdd",
        "header": ["source_name","target_name", "date", "weight"]
      },
      "field_mapping": {
        "source_name": "name",
        "target_name": "name"
      }
    }
  ]
}