Remove internal functions from public esQuery namespace.

src/plugins/data/common/es_query/es_query/index.ts

@@ -20,7 +20,5 @@
 export { buildEsQuery, EsQueryConfig } from './build_es_query';
 export { buildQueryFromFilters } from './from_filters';
 export { luceneStringToDsl } from './lucene_string_to_dsl';
-export { migrateFilter } from './migrate_filter';
 export { decorateQuery } from './decorate_query';
-export { filterMatchesIndex } from './filter_matches_index';
 export { getEsQueryConfig } from './get_es_query_config';