From f3877a2983ea78367516cface145d7f8bc555596 Mon Sep 17 00:00:00 2001
From: Luciano Bello <bel@zurich.ibm.com>
Date: Fri, 24 Jun 2022 01:37:43 +0300
Subject: [PATCH] Deprecated `QiskitIndexError` removed (#8209)

* QiskitIndexError removed

* date

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
---
 qiskit/exceptions.py                               | 14 --------------
 .../remove_QiskitIndexError-098fa04f0afe440b.yaml  |  6 ++++++
 2 files changed, 6 insertions(+), 14 deletions(-)
 create mode 100644 releasenotes/notes/remove_QiskitIndexError-098fa04f0afe440b.yaml

diff --git a/qiskit/exceptions.py b/qiskit/exceptions.py
index 7ae4d1fccd92..e086226c13da 100644
--- a/qiskit/exceptions.py
+++ b/qiskit/exceptions.py
@@ -13,7 +13,6 @@
 """Exceptions for errors raised by Qiskit."""
 
 from typing import Optional
-import warnings
 
 
 class QiskitError(Exception):
@@ -29,19 +28,6 @@ def __str__(self):
         return repr(self.message)
 
 
-class QiskitIndexError(QiskitError, IndexError):
-    """Raised when a sequence subscript is out of range."""
-
-    def __init__(self, *args):
-        """Set the error message."""
-        warnings.warn(
-            "QiskitIndexError class is being deprecated and it is going to be remove in the future",
-            DeprecationWarning,
-            stacklevel=2,
-        )
-        super().__init__(*args)
-
-
 class QiskitUserConfigError(QiskitError):
     """Raised when an error is encountered reading a user config file."""
 
diff --git a/releasenotes/notes/remove_QiskitIndexError-098fa04f0afe440b.yaml b/releasenotes/notes/remove_QiskitIndexError-098fa04f0afe440b.yaml
new file mode 100644
index 000000000000..b3191c658163
--- /dev/null
+++ b/releasenotes/notes/remove_QiskitIndexError-098fa04f0afe440b.yaml
@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    The exception ``qiskit.exceptions.QiskitIndexError`` has been
+    removed and no longer exists as per the deprecation notice from qiskit-terra
+    0.18.0 (released on Jul 12, 2021).