API response instable (and may be incorrect when paginated)
Whatever search is performed the ordered response might differ in a series of requests. For example you can perform this very basic search and just reload the page some times. you will get different order of the hits.
same happens for nearly all requests no matter if public or not. a first wild guess: multiple ES nodes prepare a different relevance score. but in contrast a order set to title will also return different items esp. on paginated results. this might be a result of the chunking and this is what makes it worse: because a single item then might occur several times in a aggregated list of all hits while the actual number of returns is correct. i will do some further investigations on this.
/cc @sfunk