[Vendor] blevesearch v0.8.1 -> v1.0.7 (#11360)

* Update blevesearch v0.8.1 -> v1.0.7

* make vendor

Co-authored-by: zeripath <art27@cantab.net>

vendor/github.com/blevesearch/bleve/analysis/lang/en/stemmer_en_snowball.go

@@ -0,0 +1,49 @@
+//  Copyright (c) 2020 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package en
+
+import (
+	"github.com/blevesearch/bleve/analysis"
+	"github.com/blevesearch/bleve/registry"
+
+	"github.com/blevesearch/snowballstem"
+	"github.com/blevesearch/snowballstem/english"
+)
+
+const SnowballStemmerName = "stemmer_en_snowball"
+
+type EnglishStemmerFilter struct {
+}
+
+func NewEnglishStemmerFilter() *EnglishStemmerFilter {
+	return &EnglishStemmerFilter{}
+}
+
+func (s *EnglishStemmerFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
+	for _, token := range input {
+		env := snowballstem.NewEnv(string(token.Term))
+		english.Stem(env)
+		token.Term = []byte(env.Current())
+	}
+	return input
+}
+
+func EnglishStemmerFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
+	return NewEnglishStemmerFilter(), nil
+}
+
+func init() {
+	registry.RegisterTokenFilter(SnowballStemmerName, EnglishStemmerFilterConstructor)
+}