Hello,
At our company we are using Elasticsearch together with GraphQL
The problem we are facing is that we would like to cleanly fetch and return the _source content of elasticsearch documents using the @elastic/elasticsearch npm package.
We got to the point where we can return documents using the following query:
await elasticsearchClient.search({
index: 'my_index',
body: {
query: {
match: {
topic
}
}
},
// -> don't return elasticsearch metadata
filterPath: 'hits.hits._source',
// NOTE: we are currently filtering out
// the fields '@version' and '@timestamp'
_source: ['id', 'timestamp', 'topic', 'index', 'type']
})
The problem with this approach is that we get results that are formatted like this:
[ { _source:
{ topic: 'user-logged-in',
index: 'tracking_events',
id: '5e1b528aa1ca021659fb1b5b',
type: 'redis-input',
timestamp: '2020-01-12T17:08:26.094Z' } },
{ _source:
{ topic: 'user-logged-in',
index: 'tracking_events',
id: '5e1b56f0a1ca021659fb1b5c',
type: 'redis-input',
timestamp: '2020-01-12T17:27:13.020Z' } } ]
How can we get rid of the top-level _source field?
We would like to format the results and return something that looks like this:
[ { topic: 'user-logged-in',
index: 'tracking_events',
id: '5e1b528aa1ca021659fb1b5b',
type: 'redis-input',
timestamp: '2020-01-12T17:08:26.094Z' },
{ topic: 'user-logged-in',
index: 'tracking_events',
id: '5e1b56f0a1ca021659fb1b5c',
type: 'redis-input',
timestamp: '2020-01-12T17:27:13.020Z' } ]
Straightforward approach:
const formattedResults = hits.map(event => event._source)
But this of course is infeasible for obvious performance reasons.
Thank you for your help!