fix type in namespace

Author: Vadim Hatsura

src/Serilog.Sinks.Elasticsearch/Sinks/ElasticSearch/ElasticsearchSinkState.cs

@@ -20,7 +20,7 @@
 using Serilog.Debugging;
 using Serilog.Events;
 using Serilog.Formatting;
-using Serilog.Formatting.ElasticSearch;
+using Serilog.Formatting.Elasticsearch;
 
 namespace Serilog.Sinks.Elasticsearch
 {

test/Serilog.Sinks.Elasticsearch.Tests/ElasticsearchJsonFormatterTests.cs

@@ -5,7 +5,7 @@
 using System.IO;
 using System.Linq;
 using System.Text;
-using Serilog.Formatting.ElasticSearch;
+using Serilog.Formatting.Elasticsearch;
 using Xunit;
 
 namespace Serilog.Sinks.Elasticsearch.Tests

test/Serilog.Sinks.Elasticsearch.Tests/ExceptionAsJsonObjectFormatterTests.cs

@@ -6,7 +6,7 @@
 using Newtonsoft.Json.Converters;
 using Xunit;
 using Serilog.Events;
-using Serilog.Formatting.ElasticSearch;
+using Serilog.Formatting.Elasticsearch;
 using Serilog.Parsing;
 using Serilog.Sinks.Elasticsearch.Tests.Domain;