[float] [[breaking_80_indices_changes]] === Indices changes [float] ==== Force Merge API changes Previously, the Force Merge API allowed the parameters `only_expunge_deletes` and `max_num_segments` to be set to a non default value at the same time. But the `max_num_segments` was silently ignored when `only_expunge_deletes` is set to `true`, leaving the false impression that it has been applied. The Force Merge API now rejects requests that have a `max_num_segments` greater than or equal to 0 when the `only_expunge_deletes` is set to true. [float] ==== On-disk term dictionary cannot be disabled The `index.force_memory_term_dictionary` setting was introduced in 7.0 as a temporary measure to allow users to opt-out of the optimization that leaves the term dictionary on disk when appropriate. This optimization is now mandatory and the setting is removed. [float] ==== Remove support for `template` in put index template requests In 6.0, we deprecated the `template` field in put index template requests in favor of using `index_patterns`. Support for the `template` field is now removed in 8.0. [float] ==== Remove synced flush Synced flush was deprecated in 7.6 and is removed in 8.0. Use a regular flush instead as it has the same effect as a synced flush in 7.6 and later. [float] ==== Indices with soft deletes disabled Creating indices with soft deletes disabled was deprecated in 7.6 and is no longer supported in 8.0. The setting index.soft_deletes.enabled can no longer be set to false. As the setting defaults to true, simply leave the setting unset. [float] ==== Translog retention settings are no longer supported Translog retention settings `index.translog.retention.size` and `index.translog.retention.age` were effectively ignored in 7.4, deprecated in 7.7, and removed in 8.0 in favor of <>.