How to enable OpenSearch 1.2 compatibility mode

Introduction

OpenSearch can be configured to present itself as Elasticsearch 7 for compatibility reasons.

Enable Compatibility Mode

Edit the following file: /mnt/jrc-confs/opensearch/opensearch.env

Append the following:

compatibility.override_main_response_version=true

Restart OpenSearch:

systemctl restart opensearch.service

Verify that OpenSearch now presents its version as 7.x:

curl -XGET search:9200

The output should look similar to this:

curl -XGET search:9200
{
  "name" : "255b6b63b70d",
  "cluster_name" : "docker-cluster",
  "cluster_uuid" : "UM2Ys0OaSwWe6W3gXItgAA",
  "version" : {
    "number" : "7.10.2",
    "build_type" : "tar",
    "build_hash" : "e505b10357c03ae8d26d675172402f2f2144ef0f",
    "build_date" : "2022-01-14T03:37:51.375300Z",
    "build_snapshot" : false,
    "lucene_version" : "8.10.1",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "The OpenSearch Project: https://opensearch.org/"
}