Add elasticsearch-admin to readme (#70)

New tool for administration

https://github.com/stephanediondev/elasticsearch-admin

- Supported Elasticsearch versions: 2.x, 5.x, 6.x, 7.x, 8.x (snapshot)
- Connection to Elasticsearch: server-side (no CORS issue), private or public, local or remote, http or https, credentials or not
- App users: register, login, logout, list, create, read, update, delete
- App roles: list, create, read, update (permissions), delete
- Cluster: basic metrics, audit, disk thresholds, allocation explain [5.0], settings [5.0] (list, update)
- Nodes: list, stats, read, usage [6.0], plugins, reload secure settings [6.4]
- Indices: list, stats, reindex, create, read, update (mappings), lifecycle [6.6] (explain, remove policy), delete, close / open, freeze / unfreeze [6.6], force merge [2.1], clear cache, flush, refresh, empty [5.0], search by query, export (CSV, TSV, ODS, XLSX, GEOJSON), import from file (ODS, XLSX), import from database (MySQL, PostgreSQL), aliases (list, create, delete)
- Legacy index templates: list, create, read, update, delete, copy
- Composable index templates [7.8]: list, create, read, update, delete, simulate, copy
- Component templates [7.8]: list, create, read, update, delete, copy
- Index lifecycle management policies [6.6]: list, status, start, stop, create, read, update, delete, copy
- Shards: list, stats, cluster reroute (move, allocate replica, cancel allocation)
- Repositories: list, create (fs, s3, gcs, azure), read, update, delete, cleanup, verify
- Snapshot lifecycle management policies [7.4]: list, status, start, stop, create, read, update, delete, execute, history, stats, copy
- Snapshots: list, stats, create, read, delete, failures, restore
- Elasticsearch users (native realm): list, create, read, update, delete, enable, disable
- Elasticsearch roles: list, create, read, update, delete, copy
- Tasks [2.3]: list
- Remote clusters [5.4]: list
- Enrich policies [7.5]: list, stats, create, read, delete, execute, copy
- Pipelines [5.0]: list, create, read, update, delete, copy
- Cat APIs: list, export (CSV, TSV, ODS, XLSX)
- Console
- SQL access [6.3]: query, translate to DSL
- Deprecations info [5.6]
- License [5.0]: read, status / start trial / revert to basic [6.6], features
- Index graveyard [5.0]: list
- Dangling indices [7.9]: list, import, delete

README.md

@@ -71,6 +71,7 @@
 * [Search Guard](https://github.com/floragunncom/search-guard) - Elasticsearch and elastic stack security and alerting for free
 * [ee-outliers](https://github.com/NVISO-BE/ee-outliers) - ee-outliers is a framework to detect outliers in events stored in an Elasticsearch cluster.
 * [Elasticsearch Comrade](https://github.com/moshe/elasticsearch-comrade) - Elasticsearch admin panel built for ops and monitoring
+* [elasticsearch-admin](https://github.com/stephanediondev/elasticsearch-admin) - Web administration for Elasticsearch
 
 ### Other
 * [SIREn Join Plugin for Elasticsearch](https://github.com/sirensolutions/siren-join) This plugin extends Elasticsearch with new search actions and a filter query parser that enables to perform a "Filter Join" between two set of documents (in the same index or in different indexes).