This is Nesu, a CouchDB to Elasticsearch synchronizer, or CouchDB changes input plugin for Logstash "contender", or "CouchDB River Plugin resurrection", or whatever you want it to call.
Setup as Command Line Tool
Run this to install Nesu as a global package:
$ npm install -g @rappopo/nesu
Go to your project folder, and invoke:
The first time Nesu starts, it'll create an empty config.json configuration file, transformer and last_seq folder in your project folder. Quit Nesu by pressing
Ctrl-c and start customizing its configurations (please see details below).
Setup as a Library
Go to your node.js application project folder, and type:
$ npm install --save @rappopo/nesu
Create an empty new js file, e.g.: nesu.js, and enter the following code:
var nesu =
Also create the config.json configuration file in the same folder as nesu.js file above like this example below:
"db":"mydb1":"idleTimeout": 0"mydb2":"cdb":"url": """name": "mycouchdb1""es":"url": """name": "myesindex1""bulkLimit": 500"idleTimeout": 10"default":"bulkLimit": 5000
$ node nesu.js
But most likely you'll want to use a process manager like pm2.
Program will automatically create an empty config.js file if missing. Two empty folders transformer and last_seq will also be created.
You might also want to change the configuration object above dynamically within your script, like this:
The value of
<config> will simply be merged with the above configuration file.
You need to create/edit the configuration file config.js in the same folder as your bootstrap file. Please see the example above.
db.<mydb>.<prop>: put your database info here.
<mydb> is the name of CouchDB database you want to stream to Elasticsearch. Put as many databases you want here, Nesu will stream all away.
default.<prop>: serve as default properties. Will be used if none are provided in
bulkLimit: max. number of documents in a bulk operation. Optional, defaults to 1000 documents
idleTimeout: how long to wait for a new changes to arrive. In seconds, optional, default to 2 seconds. If you put 0 in it, it'll use continuous stream provided by nano.db.follow instead of regular polling (nano.db.changes)
cdb.url: the url of your CouchDB server endpoint. Optional, defaults to http://localhost:5984
cdb.name: name of CouchDB database if different from the db's key name. Optional, defaults to the db's key
es.url: the url of your Elasticsearch endpoint. Optional, defaults to http://localhost:9200
es.name: name of Elasticsearch index if different from the db's key name. Optional, defaults to the db's key
es.typeField: document's key name to be used as Elasticsearch's type field. Optional, defaults to doc.
You have the ability to transform each document to something new before written to Elasticsearch easily.
All you need to do is just create a new js file inside the transformer folder with the exact name as its corresponding database. E.g. if your database name is mydb, than your transformer file will be mydb.js
And use the following code fragment as your start:
Everytime a bulk of documents is written to Elasticsearch, its last sequence is saved in a file named after the database name, inside last_seq folder.
To reset the sequence from the very beginning, just delete the file. To start from an exact known sequence, just override its content. And to start from the actual one, put 'now' (without the quotes) in it
- @rappopo/dab-couch-es, a data access layer for this kind of system
- Donation: Bitcoin 16HVCkdaNMvw3YdBYGHbtt3K5bmpRmH74Y
(The MIT License)
Copyright © 2017 Ardhi Lukianto firstname.lastname@example.org
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