为elasticsearch客户端构建XContentBuilder json查询

Question

基本上，我希望使用XContentBuilder获得以下查询：

{"query":{
    "bool": {
        "must": [
            { "match": { "fields.title": "Star"}},
            { "match": { "fields.title": "Wars"}}
        ]
}}}

下面是我的代码：

XContentBuilder query = XContentFactory.jsonBuilder()
def array = ["Star", "Wars"]
def field = "field.title"
query.startObject()
query.startObject("bool")
query.startArray("must")
array.each { value ->
    query.startObject("match")
    query.startObject()
    query.field(field, value)
    query.endObject()
    query.endObject()
}
query.endArray()
query.endObject()
query.endObject()
QueryBuilder finalQuery = QueryBuilders.wrapperQuery(query.string())

但是我得到了这个错误：

Caused by: com.fasterxml.jackson.core.JsonGenerationException: Can not write a field name, expecting a value
        at com.fasterxml.jackson.core.JsonGenerator._reportError(JsonGenerator.java:1897)
        at com.fasterxml.jackson.core.json.UTF8JsonGenerator.writeFieldName(UTF8JsonGenerator.java:185)
        at org.elasticsearch.common.xcontent.json.JsonXContentGenerator.writeFieldName(JsonXContentGenerator.java:183)
        at org.elasticsearch.common.xcontent.XContentBuilder.field(XContentBuilder.java:246)
        at org.elasticsearch.common.xcontent.XContentBuilder.startObject(XContentBuilder.java:222)
        at gde.plugin.search.elasticsearch.ElasticSearchWrapper$_clientQuery_closure16$$ERM0UO5B.doCall(ElasticSearchWrapper.groovy:737)
        at gde.plugin.search.elasticsearch.ElasticSearchWrapper$$ERM0UO51.clientQuery(ElasticSearchWrapper.groovy:736)
        at gde.plugin.search.SearchService.test(SearchService.groovy:158)
        at gde.plugin.search.SearchController.test(SearchController.groovy:43)
        ... 36 common frames omitted

奇怪的是，当我删除query.startObject("match")及其关联的行query.endObject()时，我没有更多的错误，但这不是我想要的查询……

{"query":{
    "bool": {
        "must": [
            { "fields.title": "Star"},
            { "fields.title": "Wars"}
        ]
}}}

Answer 1

看起来你需要一个额外的startObject和endObject调用。为了在每个match对象周围添加大括号，您需要这样做。代码应如下所示：

XContentBuilder query = XContentFactory.jsonBuilder()
def array = ["Star", "Wars"]
def field = "field.title"
query.startObject()
query.startObject("bool")
query.startArray("must")
array.each { value ->
    query.startObject()
    query.startObject("match")
    query.startObject()
    query.field(field, value)
    query.endObject()
    query.endObject()
    query.endObject()
}
query.endArray()
query.endObject()
query.endObject()
QueryBuilder finalQuery = QueryBuilders.wrapperQuery(query.string())