[BUG] Exiting: error loading template: failed to load template: couldn't load template: 400 Bad Request

[ZainHaiderArif]

I am getting following erro while i am trying to configure filebeat with Opensearch and opensearch dashboard.
when i try to configure filebeat with latest ELK docker image ir works fine but when i use opensearch 2.9.0 and opensearch dashboard while i setup file beat it is giving me this error
Also i have attached log file

INFO template/load.go:132 Try loading template filebeat-7.15.0 to Elasticsearch
2023-09-05T18:14:55.175+0500 ERROR instance/beat.go:989 Exiting: error loading template: failed to load template: couldn't load template: 400 Bad Request
filebeat.txt

[dblock]

Is there any more errors with that 400? Maybe on the server?
Either way, describe your setup for beats, maybe a step-by-step repro from scratch?

[dlvenable]

@ZainHaiderArif , Can you provide your Logstash config file?

Also, I see the response from the server looks somewhat like the following:

"type":"mapper_parsing_exception","reason":"Root mapping definition has unsupported parameters:

[ZainHaiderArif]

Sorry for late reply
Lemme explain a little i am using opensearch and opensearch dashoard
This is my Opensearch running at 9201
{
"name" : "opensearch-node1",
"cluster_name" : "opensearch-cluster",
"cluster_uuid" : "1jnF14_1TN-dq3EyhuKqDg",
"version" : {
"distribution" : "opensearch",
"number" : "2.8.0",
"build_type" : "tar",
"build_hash" : "db90a415ff2fd428b4f7b3f800a51dc229287cb4",
"build_date" : "2023-06-03T06:24:25.112415503Z",
"build_snapshot" : false,
"lucene_version" : "9.6.0",
"minimum_wire_compatibility_version" : "7.10.0",
"minimum_index_compatibility_version" : "7.0.0"
},
"tagline" : "The OpenSearch Project: https://opensearch.org/"
}

==================

Also I am using Opensearch dashboard docker image with that
Image for opensearch : image: opensearchproject/opensearch:latest
Image for OpensearchDashboard image: opensearchproject/opensearch-dashboards:latest

===========================

I am trying to send IIS metrices and logs using MetricBeat/FileBeat/HeartBeat
By simply editing their yml file and setting output to 9201 elastic search

But then i get error related to template
Exiting: error loading template: failed to load template: couldn't load

Also when i Test metric beat test output i get this
D:\metricbeat\metricbeat-7.15.0-windows-x86_64>.\metricbeat test config
Config OK
-======================================================
D:\metricbeat\metricbeat-7.15.0-windows-x86_64>.\metricbeat test output
elasticsearch: http://localhost:9200...
parse url... OK
connection...
parse host... OK
dns lookup... OK
addresses: ::1, 127.0.0.1
dial up... OK
TLS... WARN secure connection disabled
talk to server... ERROR Connection marked as failed because the onConnect callback failed: could not connect to a compatible version of Elasticsearch: 400 Bad Request: {"error":{"root_cause":[{"type":"invalid_index_name_exception","reason":"Invalid index name [license], must not start with ''.","index":"_license","index_uuid":"na"}],"type":"invalid_index_name_exception","reason":"Invalid index name [license], must not start with ''.","index":"_license","index_uuid":"na"},"status":400}

D:\metricbeat\metricbeat-7.15.0-windows-x86_64>

@dlvenable I am not using Logastash i am using metricbaet/filebeat/heartbeat and changing their config files

==========================
@dblock I installed 7.0.0 version of metricbeat from
https://www.elastic.co/downloads/past-releases/metricbeat-7-0-0

Downloaded zip file
enable service using .\metricbeat.exe enable modules iis and system
then when i run ".\metricbeat.exe setup -e" i get this tempate error

When i trying same thing with Elastic/kibana latest image it works fine but having this issue with opensearch