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author Charlotte Henkle <henkle@amazon.com> 1615871106 -0700
committer CEHENKLE <henkle@amazon.com> 1615953574 -0700
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Adding new templates for bugs, issues and PRs.  Adding new README.  Adding CONTRIBUTING.md and DEVELOPER_GUIDE.md

Signed-off-by: CEHENKLE <henkle@amazon.com>
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= Elasticsearch
== A Distributed RESTful Search Engine
=== https://www.elastic.co/products/elasticsearch[https://www.elastic.co/products/elasticsearch]
Elasticsearch is a distributed RESTful search engine built for the cloud. Features include:
* Distributed and Highly Available Search Engine.
** Each index is fully sharded with a configurable number of shards.
** Each shard can have one or more replicas.
** Read / Search operations performed on any of the replica shards.
* Multi-tenant.
** Support for more than one index.
** Index level configuration (number of shards, index storage, etc.).
* Various set of APIs
** HTTP RESTful API
** All APIs perform automatic node operation rerouting.
* Document oriented
** No need for upfront schema definition.
** Schema can be defined for customization of the indexing process.
* Reliable, Asynchronous Write Behind for long term persistency.
* Near real-time search.
* Built on top of Apache Lucene
** Each shard is a fully functional Lucene index
** All the power of Lucene easily exposed through simple configuration and plugins.
* Per operation consistency
** Single document-level operations are atomic, consistent, isolated, and durable.
== Getting Started
First of all, DON'T PANIC. It will take 5 minutes to get the gist of what Elasticsearch is all about.
=== Installation
* https://www.elastic.co/downloads/elasticsearch[Download] and unpack the Elasticsearch official distribution.
* Run `bin/elasticsearch` on Linux or macOS. Run `bin\elasticsearch.bat` on Windows.
* Run `curl -X GET http://localhost:9200/` to verify Elasticsearch is running.
=== Indexing
First, index some sample JSON documents. The first request automatically creates
the `my-index-000001` index.
----
curl -X POST 'http://localhost:9200/my-index-000001/_doc?pretty' -H 'Content-Type: application/json' -d '
{
"@timestamp": "2099-11-15T13:12:00",
"message": "GET /search HTTP/1.1 200 1070000",
"user": {
"id": "kimchy"
}
}'
curl -X POST 'http://localhost:9200/my-index-000001/_doc?pretty' -H 'Content-Type: application/json' -d '
{
"@timestamp": "2099-11-15T14:12:12",
"message": "GET /search HTTP/1.1 200 1070000",
"user": {
"id": "elkbee"
}
}'
curl -X POST 'http://localhost:9200/my-index-000001/_doc?pretty' -H 'Content-Type: application/json' -d '
{
"@timestamp": "2099-11-15T01:46:38",
"message": "GET /search HTTP/1.1 200 1070000",
"user": {
"id": "elkbee"
}
}'
----
=== Search
Next, use a search request to find any documents with a `user.id` of `kimchy`.
----
curl -X GET 'http://localhost:9200/my-index-000001/_search?q=user.id:kimchy&pretty=true'
----
Instead of a query string, you can use Elasticsearch's
https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl.html[Query
DSL] in the request body.
----
curl -X GET 'http://localhost:9200/my-index-000001/_search?pretty=true' -H 'Content-Type: application/json' -d '
{
"query" : {
"match" : { "user.id": "kimchy" }
}
}'
----
You can also retrieve all documents in `my-index-000001`.
----
curl -X GET 'http://localhost:9200/my-index-000001/_search?pretty=true' -H 'Content-Type: application/json' -d '
{
"query" : {
"match_all" : {}
}
}'
----
During indexing, Elasticsearch automatically mapped the `@timestamp` field as a
date. This lets you run a range search.
----
curl -X GET 'http://localhost:9200/my-index-000001/_search?pretty=true' -H 'Content-Type: application/json' -d '
{
"query" : {
"range" : {
"@timestamp": {
"from": "2099-11-15T13:00:00",
"to": "2099-11-15T14:00:00"
}
}
}
}'
----
=== Multiple indices
Elasticsearch supports multiple indices. The previous examples used an index
called `my-index-000001`. You can create another index, `my-index-000002`, to
store additional data when `my-index-000001` reaches a certain age or size. You
can also use separate indices to store different types of data.
You can configure each index differently. The following request
creates `my-index-000002` with two primary shards rather than the default of
one. This may be helpful for larger indices.
----
curl -X PUT 'http://localhost:9200/my-index-000002?pretty' -H 'Content-Type: application/json' -d '
{
"settings" : {
"index.number_of_shards" : 2
}
}'
----
You can then add a document to `my-index-000002`.
----
curl -X POST 'http://localhost:9200/my-index-000002/_doc?pretty' -H 'Content-Type: application/json' -d '
{
"@timestamp": "2099-11-16T13:12:00",
"message": "GET /search HTTP/1.1 200 1070000",
"user": {
"id": "kimchy"
}
}'
----
You can search and perform other operations on multiple indices with a single
request. The following request searches `my-index-000001` and `my-index-000002`.
----
curl -X GET 'http://localhost:9200/my-index-000001,my-index-000002/_search?pretty=true' -H 'Content-Type: application/json' -d '
{
"query" : {
"match_all" : {}
}
}'
----
You can omit the index from the request path to search all indices.
----
curl -X GET 'http://localhost:9200/_search?pretty=true' -H 'Content-Type: application/json' -d '
{
"query" : {
"match_all" : {}
}
}'
----
=== Distributed, highly available
Let's face it; things will fail...
Elasticsearch is a highly available and distributed search engine. Each index is broken down into shards, and each shard can have one or more replicas. By default, an index is created with 1 shard and 1 replica per shard (1/1). Many topologies can be used, including 1/10 (improve search performance) or 20/1 (improve indexing performance, with search executed in a MapReduce fashion across shards).
To play with the distributed nature of Elasticsearch, bring more nodes up and shut down nodes. The system will continue to serve requests (ensure you use the correct HTTP port) with the latest data indexed.
=== Where to go from here?
We have just covered a tiny portion of what Elasticsearch is all about. For more information, please refer to the https://www.elastic.co/products/elasticsearch[elastic.co] website. General questions can be asked on the https://discuss.elastic.co[Elastic Forum] or https://ela.st/slack[on Slack]. The Elasticsearch GitHub repository is reserved for bug reports and feature requests only.
=== Building from source
Elasticsearch uses https://gradle.org[Gradle] for its build system.
To build a distribution for your local OS and print its output location upon
completion, run:
----
./gradlew localDistro
----
To build a distribution for another platform, run the related command:
----
./gradlew :distribution:archives:linux-tar:assemble
./gradlew :distribution:archives:darwin-tar:assemble
./gradlew :distribution:archives:windows-zip:assemble
----
To build distributions for all supported platforms, run:
----
./gradlew assemble
----
Finished distributions are output to `distributions/archives`.
See the xref:TESTING.asciidoc[TESTING] for more information about running the Elasticsearch test suite.
=== Upgrading from older Elasticsearch versions
To ensure a smooth upgrade process from earlier versions of Elasticsearch, please see our https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-upgrade.html[upgrade documentation] for more details on the upgrade process.

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# OpenSearch
Hello!
OpenSearch is an open source search and analytics engine derived from Elasticsearch 7.10.2, and is currently in a pre-alpha state. While we're still in the process of getting set up, we are excited to build the best distributed search engine on the planet with you.
We'll update this page as the state of the project changes, so please check back frequently.
## Current state of the world
We officially began work on the new fork on January 21st, 2021. Since then, we've been removing non-Apache code and doing a full rename of the project. For more details, <add link to blogpost>
### What works
* All references to non-Apache 2.0 code should be removed, and we should be using the new project name everywhere.
* ./gradlew precommit should be passing. Please let us know if you see issues.
* CI/CD with a DCO check.
### What doesn't work
* Unit Tests
* Integration Tests
* Plug-ins
### Guiding Principles
* Great software. If it doesn’t solve a user's problem, everything else is moot. It shall be software you love to use.
* Open source like we mean it. Contributors shall be invested in this being a successful open source project for the long term. It’s all Apache 2.0. There’s no Contributor License Agreement. Easy.
* A level playing field. Contributors shall not tweak the software so that it runs better for any vendor at the expense of others. If this happens, call it out and the contributors shall fix it together as a community.
* Used everywhere. The project goal is for as many people as possible to use it in their business, their software, and their projects. Use it however you want. Surprise the community!
* Made with community input. Project maintainers shall ask for public input on direction, requirements, and implementation for any feature built.
* Open to all contributions. Great open source software is built together, with a diverse community of contributors. If you want to get involved at any level - big, small, or huge - the project maintainers shall find a way to make it happen.
* Respectful, approachable, and friendly. This will be a community where all will be heard, accepted, and valued, whether a new or experienced user or contributor.
* A place to invent and innovate. You will be able to innovate rapidly. This project shall have a stable and predictable foundation that is modular, making it easy to extend.
## How you can help
### Look for the tag "Low Hanging Fruit"
If you're excited to jump in, we've tried to mark a few issues that would be good candidates to get started on. Look for the tag "Low Hanging Fruit" to find them.
### Watch the forum, because there are a bunch of things we want to talk about
As we've been working, we've come up with a bunch of questions that we wanted to get community feedback on. Now that we're done with this first pass of renaming, you'll see us posting those questions to the forum. Please let us know your thoughts!
### Questions? Feedback?
Let us know in the forums.