Update README.md

Author: euiyounghwang

README.md

@@ -40,11 +40,20 @@ poetry install (using --no-root option when building the docker on CircleCI or D
 - Build Single Node ES with Kibana based on 7.10.0 version (You have to choose to build & create REST-API Service (`fn-elasticsearch-api`) and Pytest(`fn-elasticsearch-api-test`) instances using `./docker-compose.yml` for interacting with single ES cluster)
 ```bash
 docker run --name kibaba-run --network bridge -e "ELASTICSEARCH_URL=http://host.docker.internal:9209" -e "ES_JAVA_OPTS=-Xms1g -Xmx1g" -e "ELASTICSEARCH_HOSTS=http://host.docker.internal:9209" -p 5801:5601 docker.elastic.co/kibana/kibana:7.10.0
+```
+```bash
 docker run --name es8-run --network bridge -p 9209:9200 -p 9114:9114 -p 9309:9300 -e "http.cors.enabled=true" -e "http.cors.allow-origin=\"*\"" -e "http.cors.allow-headers=X-Requested-With,X-Auth-Token,Content-Type,Content-Length,Authorization" -e "http.cors.allow-credentials=true" -e "xpack.security.enabled=false" -e "discovery.type=single-node" -e "ES_JAVA_OPTS=-Xms2g -Xmx2g" docker.elastic.co/elasticsearch/elasticsearch:7.10.0
 ```
 - Build Multiple Nodes ES  based on 7.10.0 version with Kibana, REST-API Service & Pytest instances : Build & create instances using `./docker-compose.yml` or `./docker-build.sh` for building the docker image, `./docker-run.sh` for running the service and `./docker-tests.sh` for testing using pytest (Also you can build single cluster(`single_node`, `single_node_kibana`) without xpack option or multiple cluster with xpack : `docker-compose -f ./create-certs.yml run --rm create_certs` to create certs)
 
 
+#### Install OpenSearch based on Docker for testing
+- OpenSearch is a scalable, flexible, and extensible open-source software suite for search, analytics, and observability applications licensed under Apache 2.0.
+- Build Single Node OpenSearch with Dashboard based on the recent version
+```bash
+docker run --name opensearch-es01 -p 9250:9200 -e "node.name=opensearch-es01" -e "discovery.type=single-node" opensearchproject/opensearch
+```
+
 #### Run Local Environment
 - It will be validate the status of elasticsearch cluster using `./wait_for_es.sh` and `./DevOps_Shell/read_config.sh` for reading es host value in `./config.yaml` automatically when running `./service_start.sh` script.
 ```bash