docs(elasticsearch-plugin): Added missing inStock field for SearchInput (#3272)

packages/elasticsearch-plugin/src/plugin.ts

@@ -119,6 +119,7 @@ function getCustomResolvers(options: ElasticsearchRuntimeOptions) {
  * extend input SearchInput {
  *     priceRange: PriceRangeInput
  *     priceRangeWithTax: PriceRangeInput
+ *     inStock: Boolean
  * }
  *
  * input PriceRangeInput {