elasticsearch:使用脚本更新嵌套字段？

Question

我想在每次更新时向 nested 字段中添加一个对象。

例如，我有一个文档:

{
    "test":[{"remark":"remark1"}]
}

下次，我想在测试字段中添加一个remark 对象并保存旧的remark 对象。结果是:

{
    "test":[{"remark":"remark1"},{"remark":"remark2"}]
}

如何实现？

编辑我使用脚本:

{
    "script": "ctx._source.test= ((ctx._source.test?: []) += remarkItem)",
    "params": {
        "remarkItem": {
            "remark": "addd"
        }
    }
}

但是，我得到了异常(exception):

{
"error": {
    "root_cause": [
        {
            "type": "remote_transport_exception",
            "reason": "[es77][10.14.84.77:9300][indices:data/write/update[s]]"
        }
    ],
    "type": "illegal_argument_exception",
    "reason": "failed to execute script",
    "caused_by": {
        "type": "script_exception",
        "reason": "Failed to compile inline script [ctx._source.test= ((ctx._source.test?: []) += remarkItem)] using lang [groovy]",
        "caused_by": {
            "type": "script_exception",
            "reason": "failed to compile groovy script",
            "caused_by": {
                "type": "multiple_compilation_errors_exception",
                "reason": "startup failed:\na8220b2cf14b8b7ebeead7f068416882d04fa25d: 1: \nclass org.codehaus.groovy.ast.expr.ElvisOperatorExpression, with its value '(ctx._source.test) ? ctx._source.test: []', is a bad expression as the left hand side of an assignment operator at line: 1 column: 82. File: a8220b2cf14b8b7ebeead7f068416882d04fa25d @ line 1, column 82.\n   CILastCallResultRemark ?: []) += remarkI\n                                 ^\n\n1 error\n"
            }
        }
    }
},
"status": 400
}

编辑

现在，我想添加一个字段以确保更新或插入对象。例如:

{
    "test":[{"remark":"remark1","id":"1"}]
}

当我更新字段时，当id存在时，我将更新对象。反之，我将插入对象。

Answer 1

我建议尝试这样的脚本，它在参数中有两个参数。它将检查是否有任何嵌套对象已经包含给定的 id:

• 如果是，它将更新给定的remark
• 如果没有，它将在test 数组中插入一个新的嵌套对象。

脚本是这样的:

def updated = false
ctx._source.test?.each { obj -> 
    if (obj.id == item.id) { 
        obj.remark = item.remark
        updated = true
    } 
}
if (!updated) {
    ctx._source.test = ((ctx._source.test ?: []) + item)
}

内联并使用适当的分号后，脚本如下所示:

{
    "script": "def updated = false; ctx._source.test?.each { obj -> if (obj.id == item.id) { obj.remark = item.remark; updated = true } }; if (!updated) { ctx._source.test = ((ctx._source.test ?: []) + item)}",
    "params": {
        "item": {
            "remark": "addd",
            "id": "1"
        }
    }
}