Thanks for the suggestion.

I changed the strategy to

this.strategy = new PointVectorStrategy(ctx, "pointVector");

And the rest of the code remained same. I recreated the Index and while
searching  I am getting following Exception:

Exception in thread "main" java.lang.IllegalStateException: unexpected
docvalues type NONE for field 'pointVector__x' (expected=NUMERIC). Use
UninvertingReader or index with docvalues.
at org.apache.lucene.index.DocValues.checkField(DocValues.java:208)

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