[BUG] KNNQuery serialize precision error

[luyuncheng]

What is the bug?

There is a knn query like

KnnQuery origin = new KnnQuery.Builder().field("field").vector(new float[] { 0.1f, 0.4f }).k(1).build();

When it serialize to json string, the result would be:

{"field":{"vector":[0.10000000149011612,0.4000000059604645],"k":1}}

like the test code shows:

opensearch-java/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/KnnQueryTest.java

Lines 16 to 20 in 4436e89

	public void toBuilderPrecision() {
	KnnQuery origin = new KnnQuery.Builder().field("field").vector(new float[] { 0.1f, 0.4f }).k(1).build();
	assertEquals(toJson(origin), "{\"field\":{\"vector\":[0.1,0.4],\"k\":1}}");
	}

Do you have any additional context?

PR #882