JEDIS/REDIS 'ON' Keyword or broken query?

Very new to REDIS, and having issues using JSON/Index/Query that is driving me crazy.

Example struct

public class MyType implements Serializable {{    @SerializedName("myval")    @Expose    private Integer myval;    @SerializedName("status")    @Expose    private String status;}

I am easily using redis-stack, and pushing in this class using JSON/GSON.

Problem comes when I try to query.

I have an index set up that looks like

 Schema testSchema = new Schema().addTextField("$.status",1.0); myJedis.ftCreate("STATUSINDEX",IndexOperations().setDefault(rule),testSchema);

I then insert a few json blobs, some with status="on", and others with status="OFF"

Using redisInsight/Browser, I can see my json, with status ON and OFF as set in previous.

Using redisInsight/RediSearch:If I search usingFT.SEARCH "STATUSINDEX" '@&.status:OFF'
I get the json objects with status 'OFF' as expected.

If I search usingFT.SEARCH "STATUSINDEX" '@&.status:ON'
I get nothing.

If I repeat the test, but substitute "MYON" instead of "ON" when inserting the objects, then the search:FT.SEARCH "STATUSINDEX" '@&.status:MYON'returns the expected json objects.

I must be doing something wrong, or the value 'on' is reserved??

TIA, Wayne

Tried many different tests and combinations of status types. Only seems to happen using "ON"