feat(docs): Add elasticsearch section to Zebra book (#6295)

* add elasticsearch section to zebra book

* codespell

book/src/SUMMARY.md

@@ -12,6 +12,7 @@
   - [zk-SNARK Parameters](user/parameters.md)
   - [Mining](user/mining.md)
     - [Testnet Mining with s-nomp](user/mining-testnet-s-nomp.md)
+  - [Kibana blockchain explorer](user/elasticsearch.md)
 - [Developer Documentation](dev.md)
   - [Contribution Guide](CONTRIBUTING.md)
   - [Design Overview](dev/overview.md)

book/src/user/elasticsearch.md

@@ -0,0 +1,101 @@
+# Kibana blockchain explorer
+
+The goal here is to export block data from Zebra into an [elasticsearch](https://www.elastic.co/) database and visualize it with the [kibana](https://www.elastic.co/kibana/) front end. 
+
+**Attention:** This is an experimental feature tested only in the Zcash Testnet.
+
+Elasticsearch support for zebra was introduced to Zebra in [pull request #6274](https://github.com/ZcashFoundation/zebra/pull/6274).
+
+## Download, build and run Elasticsearch
+
+Installing elasticsearch is easy in linux and macOS by following the [.tar.gz installation guide](https://www.elastic.co/guide/en/elasticsearch/reference/current/targz.html).
+
+Make sure you end up with an `elasticsearch` binary. Run it:
+
+```sh
+./bin/elasticsearch
+```
+
+The first time you run the database, `elastic` password and the enrollment token for Kibana will displayed in the screen (See [here](https://www.elastic.co/guide/en/elasticsearch/reference/current/targz.html#targz-running)). Please save these as you will need them.
+
+Elasticsearch will listen in https://localhost:9200 by default.
+
+## Download, build and run Kibana
+
+Installing kibana is also easy in linux and macOS following the [.tar.gz installation guide](https://www.elastic.co/guide/en/kibana/current/targz.html).
+
+
+Make sure you end up with a `kibana` binary and run it:
+
+```sh
+./bin/kibana
+```
+
+ The first time you run kibana, it will provide a link for configuration:
+ 
+```sh
+Kibana has not been configured.
+    
+Go to http://localhost:5601/?code=405316 to get started.
+```
+
+Visit the url to get started, you will need the kibana enrollment token from elasticsearch and the elastic password from the previous step.
+
+Kibana will listen in https://localhost:5601 by default.
+
+You are now ready to start bumping data into elasticsearch with Zebra.
+
+## Download and build zebra with `elasticsearch` feature
+
+Elasticsearch is an optional and experimental feature, we need to build and install with the `elasticsearch` rust feature enabled using the following command:
+
+```sh
+cargo install --features elasticsearch --locked --git https://github.com/ZcashFoundation/zebra zebrad
+```
+
+Zebra binary will be at `~/.cargo/bin/zebrad`.
+
+## Configure Zebra for `elasticsearch`
+
+Generate a configuration file with the default settings:
+
+```sh
+zebrad generate -o ~/.config/zebrad.toml
+```
+The following changes are needed:
+
+### `network` section
+
+Change the `network` field to `Testnet`. The `Mainnet` should work but it is untested. Also ,the preferred p2p port for the testnet is 18233, so optionally change the `listen_addr` field to `0.0.0.0:18233`. 
+
+### `state` section
+
+Add your elastic password generated when running the database for the first time into the `elasticsearch_password` field.
+
+## Run Zebra
+
+If the config is in the default path then just running the binary will start the sync.
+
+```sh
+zebrad
+```
+
+Sync will take time, but you can use kibana to make sure blocks are being inserted during the process.
+
+## Visualize your data
+
+As soon as the first batch of data is inserted from Zebra into elasticsearch database, an index `zcash_testnet` will be created.
+
+To observe data, go to Analytics → Discover and create a new data view with the `zcash_testnet` index. Make sure you select `header.time` field as Timestamp field.
+
+To see the data, use the calendar to get records for the last 10 years, the first blocks that are inserted will be very old blocks following the chain genesis.
+
+![image info](elastic1.png)
+
+After a while the chain will be in sync.
+
+![image info](elastic2.png)
+
+You can now use all the kibana features. For example, creating dashboards for specific data visualization.
+
+![image info](elastic3.png)