String QUERY_COLLAPSE_MAX_CONCURRENT_GROUP_RESULTS = "query.collapse.max.concurrent.group.results";

    /** The key of the configuration. e.g. similar_docs */
    String QUERY_COLLAPSE_INNER_HITS_NAME = "query.collapse.inner.hits.name";

    /** The key of the configuration. e.g. 0 */
    String QUERY_COLLAPSE_INNER_HITS_SIZE = "query.collapse.inner.hits.size";

    /** The key of the configuration. e.g.  */

us, 0);\n}\n",".fade {\n  @include transition($transition-fade);\n\n  &:not(.show) {\n    opacity: 0;\n  }\n}\n\n.collapse {\n  &:not(.show) {\n    display: none;\n  }\n}\n\n.collapsing {\n  position: relative;\n  height: 0;\n  overflow: hidden;\n  @include transition($transition-collapse);\n\n  &.width {\n    width: 0;\n    height: auto;\n    @include transition($transition-collapse-width);\n  }\n}\n","// The dropdown wrapper (`<div>`)\n.dropup,\n.dropright,\n.dropdown,\n.dropleft {\n  position:...