How to correctly use the simple analyzer when indexing.

[zonggit]

here is my code:

package main

import (
"fmt"
"log"
"os"
"strconv"
"github.com/blevesearch/bleve/v2"
"github.com/blevesearch/bleve/v2/analysis/analyzer/simple"
)
type SearchDocument struct {
Path string json:"path"
}
func main() {
index()
}
func index() {
indexPath := "test_index"
if _, err := os.Stat(indexPath); !os.IsNotExist(err) {
os.RemoveAll(indexPath)
}
mapping := bleve.NewIndexMapping()
simpleMapping := bleve.NewTextFieldMapping()
simpleMapping.Analyzer = simple.Name // use simple analyzer
simpleMapping.Store = true
simpleMapping.Index = true
simpleMapping.IncludeTermVectors = true
docMapping := bleve.NewDocumentMapping()
docMapping.AddFieldMappingsAt("Path", simpleMapping)
mapping.AddDocumentMapping("doc", docMapping)
index, err := bleve.New(indexPath, mapping)
if err != nil {
log.Fatalf("Error creating index: %v", err)
}
defer index.Close()
doc := SearchDocument{
Path: "custom/tests/test_regression.py#L13-L25 ",
}
if err := index.Index("1", doc); err != nil {
log.Fatalf("Error indexing document: %v", err)
}
analyzer := index.Mapping().AnalyzerNamed(simple.Name)
tokenStream := analyzer.Analyze([]byte("test_regression.py"))
if err != nil {
log.Fatal(err)
}
fmt.Println("tokenization result:", tokenStream)
queries := []string{"test_regression.py", "test_regression", "regression"}
for _, query := range queries {
fmt.Println("start search: " + query)
mq := bleve.NewMatchQuery(query)
mq.SetField("path")
searchRequest := bleve.NewSearchRequest(mq)
searchRequest.Fields = []string{"*"}
searchRequest.Size = 100
searchResult, err := index.Search(searchRequest)
if err != nil {
log.Fatalf("Error searching index: %v", err)
}
fmt.Println("search doc count: " + strconv.Itoa(searchResult.Hits.Len()))
for _, hit := range searchResult.Hits {
p := hit.Fields["path"].(string)
fmt.Println(p)
}
fmt.Println("=====================================")
}
}

the result is

go run .\demo.go
tokenization result: [Start: 0 End: 4 Position: 1 Token: test Type: 0 Start: 5 End: 15 Position: 2 Token: regression Type: 0 Start: 16 End: 18 Position: 3 Token: py Type: 0]
start search: test_regression.py
search doc count: 1
custom/tests/test_regression.py#L13-L25
=====================================
start search: test_regression
search doc count: 0
=====================================
start search: regression
search doc count: 0
=====================================`

Why are there no results when searching for 'regression'?