通过Java API的纯字符串模板查询Elasticsearch？

Question

I have a template foo.mustache saved in {{ES_HOME}}/config/scripts.

POST to http://localhost:9200/forward/_search/template with the following message body returns a valid response:

{
  "template": {
    "file": "foo"
  },
  "params": {
    "q": "a",
    "hasfilters": false
  }
}

I want to translate this to using the java API now that I've validated all the different components work. The documentation here describes how to do it in java:

SearchResponse sr = client.prepareSearch("forward")
        .setTemplateName("foo")
        .setTemplateType(ScriptService.ScriptType.FILE)
        .setTemplateParams(template_params)
        .get();

However, I would instead like to just send a plain string query (ie the contents of the message body from above) rather than build up the response using the java. Is there a way to do this? I know with normal queries, I can construct it like so:

SearchRequestBuilder response = client.prepareSearch("forward")
    .setQuery("""JSON_QUERY_HERE""")

I believe the setQuery() method wraps the contents into a query object, which is not what I want for my template query. If this is not possible, I will just have to go with the documented way and convert my json params to Map<String, Object>

Answer 1

I ended up just translating my template_params to a Map<String, Object> as the documentation requires. I utilized groovy's JsonSlurper to convert the text to an object with a pretty simple method.

import groovy.json.JsonSlurper


public static Map<String,Object> convertJsonToTemplateParam(String s) {
    Object result = new JsonSlurper().parseText(s);
    //Manipulate your result if you need to do any additional work here.
    //I.e. Programmatically determine value of hasfilters if filters != null
    return (Map<String,Object>) result;
}

And you could pass in the following as a string to this method:

{
    "q": "a",
    "hasfilters": true
    "filters":[
       {
        "filter_name" : "foo.untouched",
        "filters" : [ "FOO", "BAR"]
       },
       {
        "filter_name" : "hello.untouched",
        "list" : [ "WORLD"]
       }
     ]
}