Down-shifting to plain search when operator usage search required

idea/testData/findUsages/kotlin/conventions/components/operators.0.kt

@@ -0,0 +1,16 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.KtParameter
+// OPTIONS: usages
+
+data class A(val <caret>x: Int, val y: Int) {
+    fun f() {
+        val (x, y) = this
+    }
+}
+
+class B
+
+operator fun B.plus(other: B): A = TODO()
+
+fun f(b1: B, b2: B) {
+    val (x, y) = b1 + b2
+}

idea/testData/findUsages/kotlin/conventions/components/operators.log

@@ -0,0 +1,5 @@
+Searched inheritors of A
+Searched references to A
+Used plain search in LocalSearchScope:
+    CLASS:A
+Used plain search in whole search scope

idea/testData/findUsages/kotlin/conventions/components/operators.results.txt

@@ -0,0 +1,2 @@
+Value read 15 val (x, y) = b1 + b2
+Value read 6 val (x, y) = this