Server crashes while creating index on agtype_access_operator in a big database

**Describe the bug**
I am trying to create an index on this expression- `agtype_access_operator(VARIADIC ARRAY[properties, '"knownForTitles"'::agtype])` to improve performance of a MATCH query containing `.. WHERE x.knownForTitles = ..`.

My local machine freezes for a while, followed by the server crash,

**How are you accessing AGE (Command line, driver, etc.)?**
- Command Line

**What data setup do we need to do?**
Using a _big_ movie database. The label `Person` contains 12,637,040 nodes.

**What is the necessary configuration info needed?**
- N/A

**What is the command that caused the error?**
```pgsql
CREATE INDEX btree_person_knownFor_Titles
ON imdb."Person"
USING btree (agtype_access_operator(VARIADIC ARRAY[properties, '"knownForTitles"'::agtype]));
```

**Expected behavior**
Create index without crashing.

**Environment (please complete the following information):**
- PostgreSQL 15.4
- AGE master branch

**Additional context**
The same command on a smaller database (~50k nodes) finishes successfully.

If the expression is used in a `SELECT` (as opposed to `CREATE INDEX`) command, it finishes successfully on the big database.
```sql
SELECT (agtype_access_operator(VARIADIC ARRAY[properties, '"knownForTitles"'::agtype])) from imdb."Person";
```

This is likely a memory leak issue. The crash is not caused by segmentation fault since it was not caught by the debugger.