The ether is another idea that was abandoned because it failed to meet experimental testing. The Michelson-Morley experiment put the nails in that coffin, and paved the way for relativity.
“Yes, but this is the same as the ether that was put to bed in name only.”
Not really. The concept as it existed is defunct, it failed experimental verification.
There are other concepts nowadays that you could say are similar to an “ether”, such as the cosmic background radiation or the Higgs field, but these are similar only in extent. Neither actually shares the properties proposed for the luminiferous ether, which would be a prerequisite to making any theory requiring an ether to work.