Templates (#12294)

Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
Co-authored-by: Lance Martin <lance@langchain.dev>
Co-authored-by: Jacob Lee <jacoblee93@gmail.com>

templates/rag-elasticsearch/README.md

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+# Elasticsearch RAG Example
+
+Using Langserve and ElasticSearch to build a RAG search example for answering questions on workplace documents.
+
+Relies on sentence transformer `MiniLM-L6-v2` for embedding passages and questions.
+
+## Running Elasticsearch
+
+There are a number of ways to run Elasticsearch.
+
+### Elastic Cloud
+
+Create a free trial account on [Elastic Cloud](https://cloud.elastic.co/registration?utm_source=langchain&utm_content=langserve).
+
+Once you have created an account, you can create a deployment. With a deployment, you can use these environment variables to connect to your Elasticsearch instance:
+
+```bash
+export ELASTIC_CLOUD_ID = <ClOUD_ID>
+export ELASTIC_USERNAME = <ClOUD_USERNAME>
+export ELASTIC_PASSWORD = <ClOUD_PASSWORD>
+```
+
+### Docker
+
+For local development, you can use Docker:
+
+```bash
+docker run -p 9200:9200 \
+  -e "discovery.type=single-node" \
+  -e "xpack.security.enabled=false" \
+  -e "xpack.security.http.ssl.enabled=false" \
+  -e "xpack.license.self_generated.type=trial" \
+  docker.elastic.co/elasticsearch/elasticsearch:8.10.0
+```
+
+This will run Elasticsearch on port 9200. You can then check that it is running by visiting [http://localhost:9200](http://localhost:9200).
+
+With a deployment, you can use these environment variables to connect to your Elasticsearch instance:
+
+```bash
+export ES_URL = "http://localhost:9200"
+```
+
+## Documents
+
+To load fictional workplace documents, run the following command from the root of this repository:
+
+```bash
+python ./data/load_documents.py
+```
+
+However, you can choose from a large number of document loaders [here](https://python.langchain.com/docs/integrations/document_loaders).
+
+## Installation
+
+```bash
+# from inside your LangServe instance
+poe add rag-elasticsearch
+```