static void Main(string[] args)
{
//Wire up an elastic client
var elastic = new ElasticClient(
new ConnectionSettings(
new Uri("http://localhost:9200")));
//Some useful constants
const string IndexName = "indexName";
const string Doc = "doc";
//Source and destination indices
var sourceIndex = "test_user_click";
const string Indices = "indices";
const string IndexNameField = "indexName.keyword";
//Process updates by each index
var indicesResponse = elastic.Search <dynamic>(s => s
.Size(0)
.Type(string.Empty)
.Index(sourceIndex)
.Aggregations(a => a
.Terms(Indices, at => at
.Field(IndexNameField)
.Size(100))));
foreach (var item in indicesResponse.Aggregations.Terms(Indices).Buckets)
{
var destinationIndex = item.Key; //Set the destination index
//Scrolling information
var pageSize = 1000;
var scrollLifetime = "10s";
ISearchResponse <dynamic> searchResponse = null;
//scrolling thru the documents to update
while (true)
{
//perform a dynamic scrolling query against the source index
if (searchResponse == null)
{
searchResponse = elastic.Search <dynamic>(s => s
.Type(string.Empty) //Ignore types completely
.Scroll(scrollLifetime)
.Index(sourceIndex) //Feature index to query
.Query(q => q
.Match(m => m
.Field(IndexName)
.Query(destinationIndex))) //Find features for the destination index
.Size(pageSize));
}
else
{
//Using scroll to get the remaining pages of feature documents
searchResponse = elastic.Scroll <dynamic>(
new ScrollRequest(searchResponse.ScrollId, scrollLifetime));
}
//have we reached the end
if (searchResponse.Documents.Count == 0)
{
break;
}
//create new bulk descriptior to hold the list of updates
var bulkDescriptor = new BulkDescriptor();
bulkDescriptor.Index(destinationIndex);
bulkDescriptor.Type(Doc);
//create a partial update for the search record
//set the current userClickBoost for each boosted document
foreach (var analyticDoc in searchResponse.Documents)
{
bulkDescriptor.Update <dynamic, PartialDoc>(s => s
.Id((string)analyticDoc.sourceId)
.Doc(
new PartialDoc {
UserClickBoost = (double)analyticDoc.userClickBoost
// additional feature boosts here
}));
}
//Send the bulk request to destination index
var updateResponse = elastic.Bulk(bulkDescriptor);
if (updateResponse.Errors)
{
//Handle errors if needed
}
}
}
}