Indexing/search algorithm stability between versions

Hello @all,
I'm migrating from Elasticsearch 1.5 to 7.10 there are multiple required changes, the most relevant one is the removal of the document type concept in version 6, to deal with it I introduced a new field "doc_type" and then I match with it when I search.
My question is, when I make the same (or equivalent because there are some changes) search query should I expect to have the exact same result set? Because I'm having some differences, so I would like to figure out if I broke something in the new mappings or in the search query.
Thank you in advance

Elasticsearch 1.5 is EOL and no longer supported. Please upgrade ASAP.

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