fix(core): expose matched indices on array fields in search hit stories

packages/@sanity/base/src/search/weighted/applyWeights.ts

@@ -29,13 +29,15 @@ export function applyWeights(
     const typeSpec = specByType[hit._type]
     const stories = typeSpec.paths.map((pathSpec, idx) => {
       const pathHit = hit[`w${idx}`]
+      const indices = Array.isArray(pathHit) ? findMatchingIndices(terms, pathHit) : null
       // Only stringify non-falsy values so null values don't pollute search
       const value = pathHit ? stringify(pathHit) : null
       if (!value) {
         return {path: pathSpec.path, score: 0, why: 'No match'}
       }
       const [score, why] = calculateScore(terms, value)
       return {
+        indices,
         path: pathSpec.path,
         score: score * pathSpec.weight,
         why: `${why} (*${pathSpec.weight})`,
@@ -149,6 +151,26 @@ export function partitionAndSanitizeSearchTerms(
   }
 }
 
+export function findMatchingIndices(uniqueSearchTerms: string[], values: unknown[]): number[] {
+  // Separate search terms by phrases (wrapped with quotes) and words.
+  const {phrases: uniqueSearchPhrases, words: uniqueSearchWords} = partitionAndSanitizeSearchTerms(
+    uniqueSearchTerms
+  )
+
+  return values.reduce<number[]>((acc, val, index) => {
+    if (val) {
+      const contains = [...uniqueSearchPhrases, ...uniqueSearchWords].some((term) => {
+        const stringifiedValue = stringify(val).toLowerCase().trim()
+        return stringifiedValue.includes(term)
+      })
+      if (contains) {
+        acc.push(index)
+      }
+    }
+    return acc
+  }, [])
+}
+
 function stripWrappingQuotes(str: string) {
   return str.replace(/^"(.*)"$/, '$1')
 }

packages/@sanity/base/src/search/weighted/types.ts

@@ -48,6 +48,7 @@ export interface SearchHit {
  * @internal
  */
 export interface SearchStory {
+  indices?: number[]
   path: string
   score: number
   why: string

packages/@sanity/default-layout/src/navbar/search/components/searchResultItem/DebugOverlay.tsx

@@ -39,6 +39,9 @@ export function DebugOverlay({data}: DebugScoreProps) {
                       <Code size={0} weight="semibold">
                         {story.path}
                       </Code>
+                      {!!story.indices?.length && (
+                        <Code size={0}>{JSON.stringify(story.indices)}</Code>
+                      )}
                       <Code size={0}>{story.why}</Code>
                     </Inline>
                   ))}