Issues with sphinx index merge. How to merge correctly?

Question

Sphinx

I make an index according to the main + delta scheme. When I read it, I assumed that after the merge in the main index there would be changes from delta.
As a result, I get that neither the old key remains in main, nor the new one appears.
If you make a selection at once on two indexes, then the new key is found (since it is present in the delta).
But doesn't merge imply that maine will have the result of merging both indexes?

Answer 1

In general, the solution to the problem:
for the merge, I called the command, as in the documentation: it is
better to call it instead
and pay attention to the morphology parameters in the index description. It is necessary that they match in main and delta indexes.