12. One or more computer-readable storage media storing computer-executable instructions that, when executed by one or more processors, configure the one or more processors to perform acts comprising: obtaining exposed log files from a log system; filtering the exposed log files based on global parameters to filter a log file having a respective global parameter less than a predefined threshold; after filtering the exposed log files, computing Bayesian posterior probabilities for relevancy between the filtered log files and a search request; computing expected values of the relevancy between the filtered log files and the search request; storing the search request and identifiers of the filtered log files as keys and the expected values of the relevancy between the filtered log files and the search request as respective values into a search data structure; in response to receiving a search request submitted by a user, finding expected values of relevancy between the search request submitted by the user and log files that are relevant to the submitted search request from the search data structure; and ordering the found log files according to a descending order of the found expected values.
15. The one or more computer-readable media as recited in claim 12 , the acts further comprising, after the storing, validating the search data structure, wherein the finding comprises finding the expected values of the relevancy between the search request submitted by the user and the log files that are relevant to the submitted search request from the validated search data structure.