_msearch returns nothing - elasticsearch

Question

I created a Elasticsearch datasource in Grafana. Its config:
{
"datasource": {
"id": 4,
"orgId": 1,
"name": "Elasticsearch",
"type": "elasticsearch",
"typeLogoUrl": "",
"access": "direct",
"url": "http://localhost:9200/recipes",
"password": "",
"user": "",
"database": "recipes",
"basicAuth": false,
"basicAuthUser": "",
"basicAuthPassword": "",
"withCredentials": false,
"isDefault": true,
"jsonData": {
"esVersion": 77,
"logLevelField": "",
"logMessageField": "",
"maxConcurrentShardRequests": 256,
"timeField": "timestamp"
},
"secureJsonFields": {},
"version": 25,
"readOnly": false
},
"id": 4,
"message": "Datasource updated",
"name": "Elasticsearch"
}
And I noticed that Grafana makes OPTIONS requests this url for data:
http://localhost:9200/_msearch?max_concurrent_shard_requests=5
Without no data.
Could you say please how to get data from indexes?
P.S. Grafana of latest version. Elasticsearch of 7.7.0.

Answer 1

Multi search request have specific format
The multi search API executes several searches from a single API
request. The format of the request is similar to the bulk API format
and makes use of the newline delimited JSON (NDJSON) format.
Header :
(Required, object) Contains parameters used to limit or change the
subsequent search body request.This object is required for each search
body but can be empty ({}) or a blank line.
Body :
(Optional, object) Contains parameters for a search request:
Below is valid request
GET recipes/_msearch?max_concurrent_shard_requests=5
{}
{}

Answer 2

You are using elasticsearch version 7.7, but your grafana datasource config show it is configured as it was using an older version, 5.6+
{
"esVersion": 56,
"logLevelField": "",
"logMessageField": "",
"maxConcurrentShardRequests": 256,
"timeField": "timestamp"
}
Try to change the version in your datasource config to 7.0+