remove ZOEKT_ENABLE_LAZY_DOC_SECTIONS

This feature has been disabled by default for a long time.

Test Plan: CI

indexdata.go

@@ -43,8 +43,7 @@ type indexData struct {
 	docSectionsStart uint32
 	docSectionsIndex []uint32
 
-	runeDocSections    []DocumentSection
-	runeDocSectionsRaw []byte
+	runeDocSections []DocumentSection
 
 	// rune offset=>byte offset mapping, relative to the start of the content corpus
 	runeOffsets runeOffsetMap

matchtree.go

@@ -989,19 +989,12 @@ func (d *indexData) newMatchTree(q query.Q, opt matchTreeOpt) (matchTree, error)
 		}
 
 		if substr, ok := subMT.(*substrMatchTree); ok {
-			// We have a feature flag for lazy decoding. If runeDocSectionsRaw is
-			// non-nil it means we need to lazily decode on request.
-			sections := d.runeDocSections
-			if sections == nil && d.runeDocSectionsRaw != nil {
-				sections = unmarshalDocSections(d.runeDocSectionsRaw, nil)
-			}
-
 			return &symbolSubstrMatchTree{
 				substrMatchTree: substr,
 				patternSize:     uint32(utf8.RuneCountInString(substr.query.Pattern)),
 				fileEndRunes:    d.fileEndRunes,
 				fileEndSymbol:   d.fileEndSymbol,
-				sections:        sections,
+				sections:        d.runeDocSections,
 			}, nil
 		}
 

read.go

@@ -328,11 +328,7 @@ func (r *reader) readIndexData(toc *indexTOC) (*indexData, error) {
 		return nil, err
 	}
 
-	if os.Getenv("ZOEKT_ENABLE_LAZY_DOC_SECTIONS") != "" {
-		d.runeDocSectionsRaw = blob
-	} else {
-		d.runeDocSections = unmarshalDocSections(blob, nil)
-	}
+	d.runeDocSections = unmarshalDocSections(blob, nil)
 
 	var runeOffsets, fileNameRuneOffsets []uint32