Elasticsearch 6.4.2 | Graph not able to see anything - elasticsearch

Installed ES 6.4.2 & Kibana 6.4.2.
Installed a trial license using the API on ES.
When I opened the graph workspace on Kibana and loaded my index pattern, nothing actually is shown. Also, the query text field is read only.
Is there any settings I'm missing somewhere? Also, are there any simple examples of Graph in GitHub somewhere?
Thanks.

Once you select the index pattern click on the + icon to add the index pattern. Select a field, add it and you should be able to use the query text field

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Fields missing on an Index of Elasticsearch from one moment to another

A strange situation happened with the elasticsearch i use to log things.
I'm using Nlog with a target elasticsearch that conforms with ECS (elastic common schema)
https://github.com/elastic/ecs-dotnet/tree/master/src/Elastic.CommonSchema.NLog
By some reason since today, some fields went missing, one of them is the very important field message.
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I did something wrong on the logs,
In the advanced options, for the template, i added an include field.
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Thanks
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I have build a custom connector to get the data from a web service and then index it. The web service response returns only the data to be indexed.
I want to delete the documents from index which are not part of the web service response during the crawl but were added to the index in the last crawl.
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Marged is correct. A feed (which is what the connector can send to the GSA) of type full will purge the existing feed and replace it. Otherwise, your connector is going to have to manage state and prune out documents as you decided.
Thanks Marged and Michael for the help.. I guess i have to write the custom logic in connector to delete the data from index.
What you're trying to achieve is exactly what happens when you send a "full" content feed. This is from the documentation:
When the feedtype element is set to full for a content feed, the system deletes all the prior URLs that were associated with the data source. The new feed contents completely replace the prior feed contents. If the feed contains metadata, you must also provide content for each record; a full feed cannot push metadata alone. You can delete all documents in a data source by pushing an empty full feed.
Marged is correct that v4.x is the way to go in the future, but if you've already started this with the 3.x connector framework and you're happy with it there's no need to rush to upgrade it. All the related code is open source and 3.x won't disappear any time soon, there are too many 3rd party connectors based on it.

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The IUpdateSearcher::Search method doesn't support searching based on the name, or at least not according to the documentation. You could search for the relevant update IDs (although these might change if the update is later re-released) or you could search for all updates of the appropriate type and then filter the results yourself.

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