I am trying to update an existing indexed document. I have indexed tags, title and owners field. Now when the user changes the title, I need to find and update the document inside the index.
Should I update and replace the entire document or just the title field?
public void UpdateDoc(ElasticsearchDocument doc)
{
Uri localhost = new Uri("http://localhost:9200");
var setting = new ConnectionSettings(localhost);
setting.SetDefaultIndex("movies");
var client = new ElasticClient(setting);
IUpdateResponse resp = client.Update<ElasticsearchDocument, IndexedDocument>(
d => d.Index("movies")
.Type(doc.Type)
.Id(doc.Id), doc);
}
It just doesn't work. The code above generates a syntax error. Does anyone know the correct way to do this using the C# NEST client of ElasticSearch?
I have successfully updated existing items in my Elasticsearch index with NEST using a method like the following. Note in this example, you only need to send a partial document with the fields that you wish to be updated.
// Create partial document with a dynamic
dynamic updateDoc = new System.Dynamic.ExpandoObject();
updateDoc.Title = "My new title";
var response = client.Update<ElasticsearchDocument, object>(u => u
.Index("movies")
.Id(doc.Id)
.Document(updateDoc)
);
You can find more examples of ways to send updates in the NEST Update Unit Tests from the GitHub Source .
A better solution in Nest 7.x:
await _client.UpdateAsync<ElasticSearchDoc>(doc.Id, u => u
.Index("movies")
.Doc(new ElasticSearchDoc { Title = "Updated title!" }));
Actually for Nest 2 it's:
dynamic updateFields = new ExpandoObject();
updateFields.IsActive = false;
updateFields.DateUpdated = DateTime.UtcNow;
await _client.UpdateAsync<ElasticSearchDoc, dynamic>(new DocumentPath<ElasticSearchDoc>(id), u => u.Index(indexName).Doc(updateFields))
For Nest 2 to update an POCO that already include an ID field:
var task = client.UpdateAsync<ElasticsearchDocument>(
new DocumentPath<ElasticsearchDocument>(doc), u =>
u.Index(indexName).Doc(doc));
also using Nest 7.x.
If you want to do only a partial update, you can use this method that worked great for me. You must specify "T, K" where T is the full object and K the partial object. Creating a POCO for every partial update is kind of overwork and annoying. For this issue, you can use anonymous object like so
public bool PartialUpdate(string id, object entity)
{
var result = _elasticClient.Update<T, object>(DocumentPath<T>.Id(id), i => i.Index(_indexName).Doc(entity));
return result.IsValid;
}
Im using the Elastic Common Schema, so here is an example of a partial object for the update:
new
{
Labels = new Dictionary<string, object>
{
{ "EscalateTo", alert.AlertState == AlertState.Escalation ? escalationId : "" },
{ "EscalateFrom", alert.AlertState == AlertState.Descalation ? escalationId : "" },
},
Event = new
{
End = alert.WindowEnd,
Duration = (alert.WindowEnd - storedAlert.StartTime.Value).Ticks
}
};
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