feat: add tracking option to search dsl

Author: jbl428

Diff for: core/src/main/kotlin/com/github/inflab/spring/data/mongodb/core/aggregation/search/SearchStageDsl.kt

@@ -48,6 +48,17 @@ class SearchStageDsl : SearchOperator by SearchOperatorDsl(), SearchCollector by
             field = value
         }
 
+    /**
+     * Document that specifies the tracking option to retrieve analytics information on the search terms.
+     *
+     * @see <a href="https://www.mongodb.com/docs/atlas/atlas-search/tracking">Track Search Terms</a>
+     */
+    var tracking: String? = null
+        set(value) {
+            value?.let { document["tracking"] = Document("searchTerms", value) }
+            field = value
+        }
+
     /**
      * Configures an option to include a lower bound count of the number of documents that match the query.
      *

Diff for: core/src/test/kotlin/com/github/inflab/spring/data/mongodb/core/aggregation/search/SearchStageDslTest.kt

@@ -213,4 +213,29 @@ internal class SearchStageDslTest : FreeSpec({
             )
         }
     }
+
+    "tracking" - {
+        "should build a tracking option" {
+            // given
+            val stage = search {
+                tracking = "text"
+            }
+
+            // when
+            val result = stage.build()
+
+            // then
+            result.shouldBeJson(
+                """
+                {
+                  "${"$"}search": {
+                    "tracking": {
+                      "searchTerms": "text"
+                    }
+                  }
+                }
+                """.trimIndent(),
+            )
+        }
+    }
 })