Update documentation on 7.6 (#4399)

* add IntervalsFuzzy as known replace

(cherry picked from commit 0a59eb9)

* update docs on 7.6

docs/aggregations.asciidoc

@@ -58,6 +58,8 @@ The values are typically extracted from the fields of the document (using the fi
 
 * <<stats-aggregation-usage,Stats Aggregation Usage>>
 
+* <<string-stats-aggregation-usage,String Stats Aggregation Usage>>
+
 * <<sum-aggregation-usage,Sum Aggregation Usage>>
 
 * <<top-hits-aggregation-usage,Top Hits Aggregation Usage>>
@@ -94,6 +96,8 @@ include::aggregations/metric/scripted-metric/scripted-metric-aggregation-usage.a
 
 include::aggregations/metric/stats/stats-aggregation-usage.asciidoc[]
 
+include::aggregations/metric/string-stats/string-stats-aggregation-usage.asciidoc[]
+
 include::aggregations/metric/sum/sum-aggregation-usage.asciidoc[]
 
 include::aggregations/metric/top-hits/top-hits-aggregation-usage.asciidoc[]

docs/aggregations/metric/min/min-aggregation-usage.asciidoc

@@ -22,14 +22,15 @@ please modify the original csharp file found at the link and submit the PR with
 a => a
 .Min("min_last_activity", m => m
     .Field(p => p.LastActivity)
+    .Format("yyyy")
 )
 ----
 
 ==== Object Initializer syntax example
 
 [source,csharp]
 ----
-new MinAggregation("min_last_activity", Field<Project>(p => p.LastActivity))
+new MinAggregation("min_last_activity", Field<Project>(p => p.LastActivity)) { Format = "yyyy" }
 ----
 
 [source,javascript]
@@ -38,7 +39,8 @@ new MinAggregation("min_last_activity", Field<Project>(p => p.LastActivity))
 {
   "min_last_activity": {
     "min": {
-      "field": "lastActivity"
+      "field": "lastActivity",
+      "format": "yyyy"
     }
   }
 }

docs/aggregations/metric/string-stats/string-stats-aggregation-usage.asciidoc

@@ -0,0 +1,60 @@
+:ref_current: https://www.elastic.co/guide/en/elasticsearch/reference/7.5
+
+:github: https://github.com/elastic/elasticsearch-net
+
+:nuget: https://www.nuget.org/packages
+
+////
+IMPORTANT NOTE
+==============
+This file has been generated from https://github.com/elastic/elasticsearch-net/tree/7.x/src/Tests/Tests/Aggregations/Metric/StringStats/StringStatsAggregationUsageTests.cs. 
+If you wish to submit a PR for any spelling mistakes, typos or grammatical errors for this file,
+please modify the original csharp file found at the link and submit the PR with that change. Thanks!
+////
+
+[[string-stats-aggregation-usage]]
+=== String Stats Aggregation Usage
+
+==== Fluent DSL example
+
+[source,csharp]
+----
+a => a
+.StringStats("name_stats", st => st
+    .Field(p => p.Name)
+)
+----
+
+==== Object Initializer syntax example
+
+[source,csharp]
+----
+new StringStatsAggregation("name_stats", Field<Project>(p => p.Name))
+----
+
+[source,javascript]
+.Example json output
+----
+{
+  "name_stats": {
+    "string_stats": {
+      "field": "name"
+    }
+  }
+}
+----
+
+==== Handling Responses
+
+[source,csharp]
+----
+response.ShouldBeValid();
+var commitStats = response.Aggregations.StringStats("name_stats");
+commitStats.Should().NotBeNull();
+commitStats.AverageLength.Should().BeGreaterThan(0);
+commitStats.MaxLength.Should().BeGreaterThan(0);
+commitStats.MinLength.Should().BeGreaterThan(0);
+commitStats.Count.Should().BeGreaterThan(0);
+commitStats.Distribution.Should().NotBeNull().And.BeEmpty();
+----
+

docs/client-concepts/high-level/serialization/extending-nest-types.asciidoc

@@ -31,6 +31,7 @@ type with NEST.
 public class MyPluginProperty : IProperty
 {
     IDictionary<string, object> IProperty.LocalMetadata { get; set; }
+    IDictionary<string, string> IProperty.Meta { get; set; }
     public string Type { get; set; } = "my_plugin_property";
     public PropertyName Name { get; set; }
 

docs/code-standards/serialization/formatters.asciidoc

@@ -28,5 +28,59 @@ foreach (var formatter in formatters)
         visible.Add(formatter.Name);
 }
 visible.Should().BeEmpty();
+
+Type GetFormatterTargetType(Type t)
+{
+    var attribute = t.GetCustomAttribute<JsonFormatterAttribute>();
+
+    if (attribute == null)
+        return null;
+
+    var formatterType = attribute.FormatterType;
+
+    if (formatterType.IsGenericType && !formatterType.IsConstructedGenericType)
+        return null;
+
+    return formatterType.GetInterfaces()
+        .Where(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IJsonFormatter<>))
+        .Select(i => i.GetGenericArguments()[0])
+        .Single();
+}
+
+var typesAndProperties =
+    from t in typeof(IElasticClient).Assembly.GetTypes().Concat(typeof(IElasticLowLevelClient).Assembly.GetTypes())
+    let p = t.GetProperties()
+    let typeHasFormatter = t.GetCustomAttribute<JsonFormatterAttribute>(false) != null
+    let propertiesHaveFormatter = p.Any(pp => pp.GetCustomAttribute<JsonFormatterAttribute>(false) != null)
+    where typeHasFormatter || propertiesHaveFormatter
+    select new { Type = t, TypeHasFormatter = typeHasFormatter, Properties = p, PropertiesHaveFormatter = propertiesHaveFormatter };
+
+var invalid = new List<string>();
+
+foreach (var typeAndProperties in typesAndProperties)
+{
+    if (typeAndProperties.TypeHasFormatter)
+    {
+        var t = typeAndProperties.Type;
+        var f = GetFormatterTargetType(t);
+
+        if (f != null && t != f)
+            invalid.Add($"{t.FullName} has IJsonFormatter<{f.FullName}>");
+    }
+
+    if (typeAndProperties.PropertiesHaveFormatter)
+    {
+        foreach (var property in typeAndProperties.Properties)
+        {
+            var t = property.PropertyType;
+            var f = GetFormatterTargetType(t);
+
+            if (f != null && t != f)
+                invalid.Add($"property {property.Name} on {typeAndProperties.Type.FullName} has IJsonFormatter<{f.FullName}>");
+        }
+    }
+}
+
+invalid.Should().BeEmpty();
 ----
 

docs/query-dsl/full-text/intervals/intervals-usage.asciidoc

@@ -249,3 +249,61 @@ new IntervalsQuery
 }
 ----
 
+[float]
+=== Fuzzy rules
+
+Fuzzy rules can be used to match terms that are similar to the provided term, within an edit distance defined by Fuzziness.
+If the fuzzy expansion matches more than 128 terms, Elasticsearch returns an error.
+
+NOTE: Only available in Elasticsearch 7.6.0+
+
+==== Fluent DSL example
+
+[source,csharp]
+----
+q
+.Intervals(c => c
+    .Field(p => p.Description)
+    .Name("named_query")
+    .Boost(1.1)
+    .Fuzzy(m => m
+        .Term(IntervalsFuzzy)
+        .Fuzziness(Fuzziness.Auto)
+    )
+)
+----
+
+==== Object Initializer syntax example
+
+[source,csharp]
+----
+new IntervalsQuery
+{
+    Field = Field<Project>(p => p.Description),
+    Name = "named_query",
+    Boost = 1.1,
+    Fuzzy = new IntervalsFuzzy
+    {
+        Term = IntervalsFuzzy,
+        Fuzziness = Fuzziness.Auto
+    }
+}
+----
+
+[source,javascript]
+.Example json output
+----
+{
+  "intervals": {
+    "description": {
+      "_name": "named_query",
+      "boost": 1.1,
+      "fuzzy": {
+        "term": "lorem",
+        "fuzziness": "AUTO"
+      }
+    }
+  }
+}
+----
+

src/DocGenerator/StringExtensions.cs

@@ -39,6 +39,7 @@ public static class StringExtensions
 			{ "Project.First.Name", "\"Lesch Group\"" },
 			{ "Project.First.NumberOfCommits", "775" },
 			{ "IntervalsPrefix", "\"lorem\"" },
+			{ "IntervalsFuzzy", "\"lorem\"" },
 			{ "LastNameSearch", "\"Stokes\"" },
 			{ "_first.Language", "\"painless\"" },
 			{ "_first.Init", "\"state.map = [:]\"" },