# Cypher Indexes and Constraints: Check your understanding Question 2(index on an array)
**URL:** https://community.neo4j.com/t/cypher-indexes-and-constraints-check-your-understanding-question-2-index-on-an-array/58794
**Category:** General
**Tags:** migrated
**Created:** [August 16, 2022, 2:09pm UTC](https://community.neo4j.com/t/cypher-indexes-and-constraints-check-your-understanding-question-2-index-on-an-array/58794 "2022-08-16T14:09:58Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@apankraz](https://community.neo4j.com/u/apankraz)
#### Post date: [August 16, 2022, 2:09pm UTC](https://community.neo4j.com/t/cypher-indexes-and-constraints-check-your-understanding-question-2-index-on-an-array/58794/1 "2022-08-16T14:09:58Z")
Hi all,
the following assessment in the Cypher Indexes and Constraints course seems to be wrong and might actually lead to a wrongful implementation and assumption of index usage.
As I understand non of the current available indexes would improve this query. Looking for a value in an indexed array property will in fact NOT use an index for lookup.
Please correct me if I am wrong and show me how an Index could be used on an actual multivalued property to find a specific value like in the example.
I would really, really like to be wrong about that 🙂
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### Author:  [@elaine\_rosenber](https://community.neo4j.com/u/elaine_rosenber)
#### Post date: [August 16, 2022, 3:45pm UTC](https://community.neo4j.com/t/cypher-indexes-and-constraints-check-your-understanding-question-2-index-on-an-array/58794/2 "2022-08-16T15:45:19Z")
[@apankraz](https://community.neo4j.com/t5/user/viewprofilepage/user-id/3828) ,
This is a BAD question that needs to be rewritten. You are absolutely correct! Cypher does not (yet) support indexes on array elements. It will be a a future release.
Thank you for pointing this out. I will change the example.
Elaine
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### Author:  [@vialard](https://community.neo4j.com/u/vialard)
#### Post date: [December 21, 2022, 4:56pm UTC](https://community.neo4j.com/t/cypher-indexes-and-constraints-check-your-understanding-question-2-index-on-an-array/58794/3 "2022-12-21T16:56:23Z")
Hi Elaine,
how come there is a formula to compute the size of the key in the documentation for an index that is not used anyway?
[https://neo4j.com/developer/kb/index-limitations-and-workaround/#index-configuration-limitations-arrays](https://neo4j.com/developer/kb/index-limitations-and-workaround/#index-configuration-limitations-arrays)
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### Author:  [@elaine\_rosenber](https://community.neo4j.com/u/elaine_rosenber)
#### Post date: [December 21, 2022, 5:33pm UTC](https://community.neo4j.com/t/cypher-indexes-and-constraints-check-your-understanding-question-2-index-on-an-array/58794/4 "2022-12-21T17:33:36Z")
That KB article is a general purpose description of how data is stored in the db.
In 5.0, there is now support for string arrays in full text indexes
[https://neo4j.com/release-notes/database/neo4j-5/](https://neo4j.com/release-notes/database/neo4j-5/)
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### Author:  [@vialard](https://community.neo4j.com/u/vialard)
#### Post date: [December 21, 2022, 7:27pm UTC](https://community.neo4j.com/t/cypher-indexes-and-constraints-check-your-understanding-question-2-index-on-an-array/58794/5 "2022-12-21T19:27:53Z")
I suppose you meant:
> * * *
>
> In 5.0, there is _ **NOW** _ support for string arrays in full text indexes
Nice. But I have to convert my integer IDs to strings, define a fulltext index using the keyword analyzer and then start all my queries by a procedure call to retrieve the matching nodes instead of letting the query planner do its job like with a normal index.
And it is still weird that in 4.4. you can define a b-tree index on any array property that will never get used.